Now that the dust settled, tell her you were just very worried about her. She should understand. I'm 33 and I still let my Mom know when I get to were I'm going (if she is aware of the trip). She does the same for me; let's me know she got to her destination if she knows I'm worried about it. It has nothing to do with being babied, it's piece of mind and respect. I think she'll understand and if you explain it to her she won't do it again.

Good luck! I think Rosanne Bar said "I'm raising two thirty year old teenagers". I don't think you ever stop worring.