I received some very pretty daisies on the last day of school from a student. She handed them to me right away in the morning at the same time 5 other students were handing me gifts (and a ton of other students were surrounding me and giving me hugs). I'm sitting down to write thank you cards now, and I'm not 100% sure that I know who gave me the flowers. I know it was a girl, and I'm about 80% sure that I know who it was. There wasn't a note or card. I should have written it down right away. Should I mail a thank you card to the student that I'm pretty sure gave it to me? Or, do I just not mail one at all?