Did you achieve the goals you set for yourself in therapy with her?

If you didn't, I don't see a good reason not to go back, unless your interaction with her was harmful to you or you were in it, heart and soul, for a long time and didn't make progress.

Attachment is a great sign in psychodynamic therapy. Relationships with attachment enable you to really process deeply, learn, feel safe once the attachment is somewhat secure, not to mention, work through attachment issues. With progress, it lessens to where you both agree you're ready to stop regular appointments, therapists will often allow you to return as needed, too.