My thought is you should quit. You can always go back to your T if things are not working out and you feel it was a mistake. If you feel like you're outgrowing her I think that's totally plausible, it happens. You should talk to your therapist about it first though, she might have a different view that's worth hearing out.

I just want to present another possible reason your T could be using this strategy with you. If perhaps you are very critical of yourself and are beating yourself up over SI and dependency, many schools of thought would say that must be addressed first. Sometimes these issues can be the result of feeling a low self-worth. There would be absolutely no good of your T making you feel even worse about it because the underlying problem is that you feel so bad about yourself. She might be trying to show you the kind of unconditional positive regard you should show yourself, i.e. by allowing yourself to feel dependent and be ok with feeling that way, observe the feeling, perhaps try to understand why you feel that way, what in your past might have led to this defense, without judging the feeling as good or bad. I don't know about SI except in the broader sense of doing bad stuff to myself, but I know about dependency. I'm also not a therapist, so this is just my uneducated opinion.