Has your wife been evaluated for post-partum depression? It sounds a lot like what my wife went through after our 2nd child was born. She was diagnosed and put on A/D's and it make a world of difference in her attitude towards everything.

Me: 60 w/ S18, D24, D27

M: 21 years; BD: 06-14-12; S: 09-10-12; D final: 03-17-14; XW:57