Hey there -- this is a fine choice of forums for this issue.
I think if it were my user having this problem, the first thing I'd do is narrow down whether the issue is with the user or the machine. So, if the form works great on your machine (for example) have her log onto your computer and try the form. Does it work correctly for her there? Then you can log onto her machine and try the form....
If it is the machine, I think I'd clear the InfoPath cache first of all. Then, I might go ahead and run a repair on Office. If the machine still has issues with the form, I'd pitch it out the window. Not really -- I'd probably start checking the Internet Explorer settings (IE and IP are pretty cozy) and compare the "bad" machine to a good machine. If I didn't find anything, THEN I'd pitch it out the window....