I'd say that is asking a bit much from her.
Did both snakes come from the same place? It sounds like it, so if both share the same quarantine area then you could pair them fine.
I just think it's a bit unlikely she will put on 500g and maintain good body condition that quickly - especially as quite a few females hit the 1000g feeding wall and take a bit of a fast.
Definitely get her on a good feeding schedule if you can and monitor it to see how she does for a month or two before deciding one way or another.
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