I think you should make your decision around this according to the policy that your T has or seem to have. Perhaps she hasn´t told you anything about e-mailing her during holidays and in that case, I´d try but without expecting an answer. In my country I think there are very few T:s who´s on call during holidays, nearly none in private practises and a few within psychiatric care.

I don´t think it´s anything wrong with e-mailing your T but I would say you should be prepared that she perhaps won´t answer. I hope she will of course, I know how hard it can be having sent an e-mail and then having to wonder if the T got it and read it or not.