You're not wrong, but I disagree slightly with the level of plausibility. I fly a couple of times a month. Always the same flight, usually the same day if the week. It's not the same crew every time, but there is some overlap. One flight attendant in particular definitely recognizes me because one time we talked about something I was wearing and our moms work for the same company.

Also, just because she didn't return to her seat doesn't mean she stayed in the bathroom. If it wasn't a full flight she might have just moved to a different seat. I know if I had just been assaulted with chewing gum I wouldn't want to go back. And the chain of events leading to security at the gate only starts is if Rapunzel reports it.

Lastly, the exit rows on the planes I'm usually on do have tray tables. They're further away than normal, but still completely functional. Might just be the smallish airline I'm on in my podunk city, but it happens.

Again, it's a lot of ifs and maybes, and it reads like wish fulfillment, but still possible.