What is reparenting? L says that's what we are doing. Is it because we are working on parts? Is it because I have maternal transference with her? Is it normal/okay?

I'm so used to skills therapy: CBT/DBT. L says we're doing relational therapy. I don't mind it. So far the results are good. I want to get to a place where I have a secure attachment to her. To me, it's just so different than what I'm used to. Other Ts (even T), after a certain amount of time, were ready to push me out the door "fly my wings". I never felt ready. L is more about long-term therapy, and while it feels good, I'm wondering if it's okay. Is it bad to do this type of therapy? Has anyone done this type of therapy and found success? I guess I worry because it feels good even though it can be painful as hell going through my past "ghost" and templates.