OP I doubt she's thought it through to the point of deciding that the things she has boasted about making her a good mother to thinking that makes you a bad one in her eyes.
People use Facebook differently but it always surprises me when someone decides to tell everyone else on their friends list to stop doing something that annoys them.
I know that's not what you are saying here. But it happens so often, either actually on Facebook or on threads here.
We all have things that we find it hard to read. I find looking at baby scans or those week by week pregnancy development tickers really upsetting at times. I hide those posts rather than unfollow the friends posting them, because it's up to them what they post and up to me what I leave to read or look at.
I lost two babies, it's taken a lot for us to have DS. I do post about him, pictures of him, things he's said or done, achievements if he has them. I know not everyone else on my friends list is as thrilled with him as I am but I have people I have never met, but who I still consider to be very good friends, delighted for us that DS is here and enjoying following his highs and lows as he grows up. And sadly some family who could barely care any less.
I sometimes see people on there saying "If any of you post one more game request/juice plus message/picture of your dinner/share if you hate cancer but love kittens then I will delete you" and yes those things are annoying but if someone wants to share them that's their business. If someone else wants to delete an otherwise good friend for it, that's their choice.
And if it's someone you aren't that bothered about in real life but feel you have to keep them, block the app they keep posting from or unfollow them if you don't want to delete them, rather than dictate to them what you think they should do in their own time on their own profile.
Your friend does sound a bit more gloaty than most, but that said, I like to joke to DH that DS gets all his good points from me because I spent the nine months concentrating. We're not serious, but it might not come across that way to anybody listening.
She's proud of her child, she expresses that by laying it on with a trowel differently to the way you would, and differently to the way many people on here think she should, but unless any of those people are Mark Zuckerberg I don't think they really get to tell her or anybody else how to use Facebook.
But I really don't think she's making her posts with you in mind as the anti-her or anything. If people didn't post something for fear of someone else reading something into it or feeling badly compared then the internet would be empty.