IndigoJo wrote:
However, she also turns out to be an old friend of my sister's from school, who may also have known quite a few people who were hostile to me back then.
Does your sister still have contact with this person, and know that you may be assessed by her? If not, then I would personally have very little worry about being assessed by her.
One complication is that a full assessment will usually involve collateral information from people who knew you as a child - parents, siblings, guardians etc. I would still have little worry that these interactions would ever be used against you.