My personal opinion is that I wouldn't, if your privacy is a concern.
Your ID and details will be held by her. She doesn't have to abide by any security standard or is held accountable for the secureness of that data. She could lose control of that data with no malicious intent at all, so her trustworthiness doesn't come into play.
Then theres the fan site. Leaks happen all the time, and given how much premium content is freely available online from these places I wouldn't trust them to securely store that ID in a manner that won't get leaked out either.
Seems like an awful lot of exposure if having your identity leak is going to be a problem for you.