[izmosmolnar]

Spoiler for don't read if you are not interested in another pointless debate:

Well as I said I can't read any Japanese so here's the english version (I hope that's not prohibited or anything, but I wanted to be accurate rather than summarize some important parts):

Spoiler for gamequote:

eva-b: "There's no point unless I have new furniture, suitable for me. I acted out of obligation... But I've hated old things from the very beginning."
As she said that, she looked down at Belphegor's remains which had already finished turning into a pile of gold dust, with disgust.
Rud: "I don't know what you're talking about. Be a good girl and put your hands up."
Then the witch obediently raised her hands. But instead of raising her hands because a gun was being pointed at her, it looked more like she was a conductor facing an orchestra, waving her conductor's baton.
eva-b: Come, arise, furniture suitable for me...!! Not that cheap furniture, much stronger ones! Cruel ones!!! hahaha
Kyrie: Stop this bizarre act...! I'll pull the trigger
*Butterflies flying*
In response to the witch's call, the hall was once again buried with the color of gold. As the brilliantly radiant gold butterflies danced, it felt as though they were being sucked into an ocean of gold leaf. Ronove was shocked at that upsurge in magic power... That was because it far surpassed that of his former master. As their eyes were dazzled amidst the golden flash, a gunshot could be heard. Either Rudolf or Kyrie had fired a round.
... Then, after the golden flash, had subsided, the witch, who was at least cool and composed, could be seen.
The bullet? Hadn't Kyrie fired it into her? But the witch had not been hit anywhere on her body. There it is... The bulled had been fastened in midair right in front of the witch's chest.
Ronove: "A... a bullet-proof barrier...." A barrier which took even the predecessor a significant amount of preparation had, in an instant... Ronove's face was still twisted in shock. And the surprise did not stop there.
*again butterflies*
The group of gold butterflies had created two humanoid forms. It was furniture summoning. The butterflies peeled off and flew away, and beneath them, furniture in the shape of girls showed themselves.
Ronove: "... the Siesta Sisters corps...even the predecessor... wasn't able to summon them on a moment's notice, the corps in memory of pendragon, and so easily...
*introductions, Lucifer appears, shooting snakes, Rudolf-Kyries dies, Beato comes to argue, Siestas threatening her to go, B. goes to Metaworld, Virgilia comes and"acts" like she is scolding her, Eva-b keeps repeating the killing, a wild Hideyoshi appears ( ), he slaps her, a floating gun kills him*

---
I may be overassuming (me? never... ), but at the time she casts her spell, she fixed her gaze on Sloth's remains. Immediately the gunshot goes, so it's not entirely possible to follow what's happening with the golden dust which once Sloth had been. After the gunshot settled the 2 girls appears. I tend to believe that eva-Beatrice was concentrating on the golden Dust the entire time, and not conjured them girls from the thin air, with close to no experience in spellcasting and without any materialistic sacrifice. There is no mention of the dust after that, so it's debatable what happened with it. My guess is that she used it as a catalyst to summon the siestas.
I mean if we can believe when Ronove first appeared in the story, Beato said something like how many expensive reasources, sacrifices and magical energy she had to gather and sacrifice, in order to summon Johnny Depp.
If she tells the true, I can't imagine how can Eva-B (with Level 1 magical experience) summon something so powerful like the S sisters (judging by Ronove's reaction they may be even stronger than him, ergo the sacrifice should be higher too in that case).
Just look at it from that angle here: If someone really has to sacrifice some stuff (provided Beato was telling the truth) to bring such powerful magical creatures like Ronove or the Siesta neechans in that world, than the only worthy price for the Siesta sister's summon I can consider, is the possibility that 2 of the 7 sin sisters remains irreversibly dead. Kinda like sacrificing them to help summon the more powerful girls.
If not what materials did she sacrificed? Or was Beato lying about that? (for what reason other than confusing such people like me? )

It's debatable yes, for the main reason because Leviathan died upstairs by Kyrie, so we can't even guess what happened with her remains. However as Eva-B is performing magic it sounds quite stupid, that she is required to concentrate on Leviathan's remains with her own two eyes, in order to "sacrifice" it. (I doubt she could watch/concentrate on two things simultanously anyway. Just because she is a witch, she still only have a pair of eyeballs ) . Not to mention if she didn't needed the 2 dead girls as a Catalyst, why didn't she summoned three or four Siestas instead (or a whole army even)?

But of course like Ange learned from Okonogi in ep4, it's up to the viewers beliefs what she considers the truth.