During the year we all got to nominate a charity to raise money for on a fun day at work. My charity was drawn 
She openly slagged my charity off as not worthy, turned a few around in the team who on the day declined to join in with the fun and games (she is a team supervisor) and stop a decent amount being raised.
I want to give her a laminated certificate, her gift is my donation of £5 to said charity.
I will donate the £5, she will know it is me. My question is it will probably taint secret Santa this year so should I do it? Would you?