Geesh, my initial response was..."what is a 46 yr old woman doing at a bar celebrating a kids 21st birthday?"...and as Karen said below...why weren't you included?
I don't mean that to say that she shouldn't go out with friends/co-workers to do things....this one just seemed jeuvenile to me. Doing something like this occasionally isn't a problem...but she definitely should have called to let you know she was going to be late.
I think it's great that she's gotten in shape at 46 (working on it myself now at 40 again), but I have to wonder....she's got this great body now, she's hanging out with people younger than her (the people I've noticed that work at gyms tend to be young) and now she's gone out all night at a bar....hmmmmm. Makes me think of a female mid-life crisis of sorts LOL. May be nothing to do that at all though.
I would simply tell her than in the future, she needs to call if she's going to be late so that you don't worry. Now, if she starts doing this more often, that's another issue.
