I know you have already gotten good advice and have an idea of what to do, but just wanted to add something as a therapist. If you decide you otherwise want to work with this therapist, you can have a conversation with her about how you and your daughter would like her to interact (or not interact) if you see her outside of sessions. Acknowledge you/greet you or not? Have any kind of conversation (not related to therapy) or not talk at all. These are things you can pre-arrange so you and your daughter are the most comfortable; the therapist would likely bring this up if you contact her anyway, but just wanted to point this out.
lucky single mom to 20 yr old dd and 17 yr old ds through 2 very different adoption routes