Does she work? If yes, does she work full time? It sounds like perhaps she's stressed about her financial situation. You've mentioned her options to you are to give her half your pay and pay for day care OR live in so she can go to work. Perhaps even with your pay (and her pay if she's working) that it's not enough to pay her rent/bills and feed and clothe the child. It could be that or as others have said, PPD, or a combination of the two.
From your first post, you said you try to be there three times a week. That leaves her with four or more days a week, raising the kid by herself. From what everyone I know who has a child has said to me, it is tough to raise a child. Perhaps she is just really struggling and it's stressing her out and she's lashing out. You go and work and I imagine have a social life of some kind and she can't because she has to watch the baby. I imagine that would be frustrating.
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-Elle-
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