Do you know of any sources that explain the connection?

It doesn't take a rocket scientist to think that inserting yourself, a non state actor or intelligence asset, in between a conspiracy / murky operation of the Epstein sort might not be a great idea. Similar to how starting a militia for any cause is likely to attract negative attention from the gov boys...

That's why she wants help setting up a secure site for leaks.

You've effectively answered your own question sport.

I would assume that she could create an email address using a service like Proton and access it through Tor Browser.

There's a lot more to come out on this part of the story in the coming year.