I've never heard of EFT before, but got curious and found this ... grrr, boards won't let me post a link, too few posts. Anyway, it was the second result in a google search for "eft negative effects", so you might have found it already, and it was unhelpful?

Anyway, if you feel your therapist is out of her depth, that might very well be the case. Is this something you can discuss with her? Do you have the option to switch therapists?