Dear god, is there really any need for the keening and wailing and competitive upset?
I don't believe for a single second that this woman left her 6 week old baby completely alone and screaming for 3 hours. Don't believe a word of it.
Not one person on here apart from the OP knows this woman at all. Yet you are all happy to condemn her as an abuser because she said something overly defensive.
Have none of you ever said something daft when you felt criticised or pushed into a corner? I certainly have.
I've heard no mention of a father at all so can only presume she is an LP. Can any of you imagine what it must be like to be a lone parent to a newborn baby? I'm not surprised she's being defensive I'd be she feels judged every step she takes.
OP if you really do want to be a good friend, and you haven't started this thread just to show what a wonderful person you are for being so terribly upset, then go round and see her. Hold the baby for 10 minutes so she can have a shower. Make her a cup of tea, maybe even talk to her in a completely non-judgemental way rather than as the parent she so obviously admires and offer to go round in the evening a few times to give her some moral support.
As for all the "I'm so upset", "well I'm in tears", "well I feel sick", "well I've actually been sick", "well I feel faint at the horror" nonsense, words fail me.