Although they have been in Bath a week or 10 days, how many times has Anne actually had a chance to talk to them about this?

Her first two encounters with them were 'visits of ceremony'. The Crofts paid a duty call to Camden Place, and the Camden Place people visited back, but Anne would not have broached this subject at that time--not in front of her father and Elizabeth, and probably Lady Russell. At least, I don't think she would.

Other than that, the Crofts always seem to be busy with friends. I got the impression that Anne sees them from Lady Russell's carriage but does not necessarily have a chance to speak to them at all herself, and certainly never without Lady Russell there.