Did she always say things like that about kids, before your little one came along? Or has it become harsher?
I'm wondering if she's feeling that she's been replaced by your Bub. And of course she has, as quite rightly no one takes precedence over your kids, but maybe she's struggling with that and doesn't know how to express it? Or maybe she's jealous of what you have in your life. One of my best friends was always having digs at me when I started dating my now DH. It's true that I did have less time for her...that's life...it evolves like that.
If you want to save the friendship then maybe try to make a little alone time with her if you can. If it doesn't help, then I would let the friendship slide though.