If she has an email address, and it's important to communicate with her, I'd go ahead and send an email. But don't start off asking or saying that you hope it's okay to email. If she answers, you'll know what her preference is. I didn't ask mine; I just did it. Especially if you're going through a particularly hard time, I don't think it's needy at all. I wouldn't see a therapist who saw anyone as needy.