Sometimes people just distance themselves from other people and there doesn’t even have to be a reason. Although she did give you a reason that she’s busy, but you think she’s lying. I don’t know. I’d say anyone with a job and a husband is reasonably busy. There’s only that much time to see friends

Do you reciprocate taking her and her husband to dinners on their birthdays? If you don’t, perhaps she feels she should stop too.

I have a friend who takes me and i take her to dinner for birthdays and I have a very old friend with whom we exchange gifts but I don’t do anything for my other friends’ birthdays and they don’t do anything for me except saying happy birthday. I’d expect my husband to do something for my birthday but not a friend and her husband.

Honestly it just sounds like acquittance who moved on with her life. She’s not very invested as a previous poster said