Well, I don't think Eva's money trouble are as serious as Rosa's, plus unlike Rosa, she doesn't seem to have as deep a buried hatred for the other siblings (she just doesn't care enough). That is to say, that if she had a motive for murder in episode 3, then it was probably related to the gold and as was suggested, the second twilight could be an accident or a desperation murder. But then who knows.
P.S. Hard to answer the question of who would be most likely to kill for money, but I'd say Rosa would come first with Krauss as close second.
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