"I thought it was about her [b]US F2000 National Championship[/b] membership in [b]2001[/b]"
Well, that info seems to be at http://www.usff2000.com/season2001/results.htm
I'll bet you've already been to http://www.vaninaickx.com/
"it's concerns memberships in which year ?! 2000 or 2001 ?"
I'm guessing she became a member in early 2001 for the 2001 season.
"What do this address and phone number was corresponding to ? Her club or her residence?"
I would guess her residence at that time.