Simple solution if you want to kee the friendship; start meeting up elsewhere. Her house, parks, playcenters. That way her kids behaviour isn't your problem.
I agree with this. Don't meet at your place. I too was with you until the kids should behave thing. They don't, not always. She does sound like she's struggling, but also that she might be a bit meh about it all. I soooo wouldn't tell her you'll catch up but sans kids...you won't be seeing her again. Most babies at 7 months are easy...even the ones who aren't are easy compared to an older child. My 13 month old is way more work than she was at 7 months old, and that's just going to keep happening as she grows.