That's SA -- I'm nervous around my best friends a lot of the time.
But a therapist is different - if all she's doing is causing you anxiety, you should probably stop. Think of how she's helped you - has she really done that much? If you think she's been helping you, I'd suggest keep going - if she's just somebody who makes you MORE anxious, I'd suggest stopping. After all, therapists ARE supposed to help and support you - not support your social anxiety disorder.