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The GM was made for mass production(And stripped down heavily) and has very few if anything resembling that of a real Gundam hence why those like Char don't even acknowledge it as a Gundam in the OYW. Not even the Feds considered the GMs as Gundams due to the many differences between the Gundam and a GM despite the GM being created based off the data of the Gundam.
However the Delta Plus was created as a successor(And it is a clear improvement over it) to the Delta Gundam and was only pushed through limited production. That and outside the Unicorn and Banshee it was clearly beyond that of a mass produced variant and fit in with the whole Gundam theme.
Marida calling it a Gundam isn't a spur of the moment thing since she didn't consider any other mecha but the Unicorn and the Delta Plus as Gundams. Which means she most likely had data on the Delta series(Since it's very unlikely she's ever seen the Hyaku Shiki) at the very least which was a Gundam series even if it was a failed one.
It also makes sense that she would have data on the Delta Plus(Most likely provided by the family that screwed with her head) considering it was one of the higher end MS at the moment. That and she's already faced it a few times(Albeit she did ignore it more in favor of fighting the Unicorn), of course she wasn't Gundam crazy until after the mind screw...
GM Series isn't considered Gundam, it's a mass production series.
Delta series is.
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