Pop Goes the Weasel (Part 3) by Amethyst

or perhaps when she's due for release?

Yup, that would make sense,

wouldn't Scamper's therapist be obligated to make sure that information gets passed along when she tells them?

Depends on what is said.

Yup, as Domo said, it depends on what was said and if specific people are named. But if they informed Lily or her guardian, they would have to ensure not to reveal their source, nor anything about her beyond that information, including her relationship to Lily.