I think it's better to give it to her personally if you feel up to it. If she doesn't accept it, she will tell you in person anyway, but I think it's better to give yourself and your therapist the chance to discuss it on the spot and decide together. At least that's what I think. I know when I first gave my therapist a gift (my first therapist pretty much) I was very afraid of him rejecting it (and in my case it was actually something I'd made myself) but I gave it to him face to face in spite of not knowing how he'd react. It was actually a very touchy moment between us with both of us feeling moved. Then again I'm not saying that will be your case, I really can't know that. Just sharing my experience for what it's worth.