So at first I was all "they just had a baby, cut them some slack." But reading furthwr she sounds pretty self absorbed and probably always has been but right now it sounds even worse. The world does not revolve around her or her pregnancy and you need to live your own life too.

But rather than cut her off completely, I would just take a break from the friendship for awhile. Just stop texting her and don't respond to hers. If she asks and gets pushy, just tell her you're really busy. If she pushes it further, just tell her the truth but in a gentle way. Just say you've been hurt by some of her behavior since her pregnancy and you feel you've gone out of your way for her but feel she hasn't done the same, and you're hurt by that. Tell her you need a break from the friendship right now and you will contact her again. If it goes this far and she gets angry over you handling this in a mature way and she throws a hissy fit, then yeah, the friendship is definitely not worth it.