I think the edginess is being helpful and I would keep working on what is causing it and how I could help myself with it and/or ignore it. So you're anxious, so what? Your therapist doesn't need to reassure you that she is not your mom, you need to see that yourself, internally. Find/start to notice incidents where she responds differently than your mom responded or how you expected her to respond. Having a growing pool of good memories to draw on will make you braver and the anxiety won't be there anymore. Just masking/blunting it won't help it, the cause will still just be there. It is showing itself because it wants to be worked with.