She has been going for swimming lessons for the past 9 months and tomorrow is her teachers Birthday...I just found out and do not have much time to get a gift being that DDs swim lesson is tonight. What do you think a good gift will be?? Should I do a card with money?? If so, what do you think is a good amount?

I work until 4 and her class is at 530 so I do not have much time to shop at all :(

THANK YOU