That is a good idea, I tried it just a short moment ago after my new teen actor didn't travel. This was her 2nd prom attempt, 1st I figured failed cause she was at the family store running it at the time.
This time I had her stay at the school nearly the whole day just working on acting and painting, tell the prom prompt came up. Told her to travel and nothing.
This is the first time I've had this start to happen, seems to only have started since the holiday sale and when I got bored and bought Batuu, But none of that should of effected this at all.
My Partner is able to send her Teens to prom on her computer, we have nearly the same mods installed as well, just one she has that I don't have installed.
This Teen Sim I'm not overly worried about it though, just concerned for future ones if it starts to keep happening with them. Previous Teens in the same save i'm using were able to go just fine, and I have seen them show up at the High school during normal class time too.
Not sure what to try, already did a full repair and reinstall yesterday when I had trouble with a pack installing properly.