My best friends been driving me insane

I know she’s dealing with ppd and adjusting to being a mom of 2 but everyday all she does is complain. I’m dealing with being a new mother myself and own emotions and I hate getting all these negative texts everyday especially when I give her advice and she won’t listen because “this ain’t her first kid”. Sometimes I won’t even reply because I get annoyed and she’ll still text me “this kid keeps crying!” “I’m gonna beat connors ass he ain’t listening” “I’m letting this kid cry because I’m sick of him bitching all the time”. Her first born is spoiled and before the baby was born he got away with everything so now when he acts out she acts like it’s new. Not to mention she treats the new baby differently, as if babies aren’t allowed to cry. I feel like a terrible friend but everyday it’s the same shit and same complaints that I don’t know what to say anymore to make her feel better. Before we could talk all day and now it’s “me me me me” and I can’t deal with my emotions and hers. I just don’t know what to do and I know if I mention something about it to her she’ll act like it’s the end of the world and probably stop talking to me.