You set your boundaries, but your OH has the right to set his.
I speak to my adult DD's, daily, especially now one is getting married and one is pregnant.
I'm not interfering in the wedding, though, I'm giving an opinion, when asked, but tbh, I think I have been influenced by MN (I may have bordered on interfering before I joined here).
Pick out, what bothers you, her contacting him isn't something you should have an opinion on, but likewise he should respect your privacy and not over share your business.
He can however discuss anything which affects him with who he likes, which my DD's have made clear to their DP's.
You don't have to hear about her opinion, though, he perhaps should be keeping some of what she is saying to himself.