TIFU by letting someone lose their water bottle

I take a public bus every day. On the bus today there was a girl who stood up to get ready to get off the bus, but she wasn’t holding onto something and she fell backwards when the bus made a sudden move. When this happened, her pink water bottle fell out of the pocket on the side of her backpack. I saw the whole thing and I was right across from the seat which the bottle fell under. Me, being a shy idiot, decided to pretend like I didn’t see it, hoping someone else would pick it up and give it to her. This was not the case though, and she ended up getting off the bus, leaving her water bottle rolling around the floor of the bus. Who knows, maybe that bottle had a high sentimental value to her, and I just let her leave without even trying to get the bottle back to its owner. It gets even worse when you take into account that I was getting off at the stop right after hers, so even if I had to get off the bus to give her the bottle, I would have just had to walk an extra block to get to my destination. I feel so guilty about it since I could have done something, but I didn’t.

tl;dr: A girl on the bus dropped her water bottle and I did not pick it up and give it to her before she got off