I'm going to guess you are using a BES. If you wish to wipe her phone the best way to do it is issue it from the BES. Right click on her name and click on Disable and Wipe Handheld. This in turn will send a signal to her phone to wipe and what not, when the phone comes back on it will be totally wiped but as soon as she reactivates with the server, The BES will basically reload her phone and will put all of her settings back to the way they were.
Now when you disable and reload her device do NOT delete her user from the BES, just reset her activation password and you are good to go. This is how I have been wiping my device everytime I "break" it
and it works great.
Also with the 2 Desktop calendars that is usually the cause of the problem the wipe should fix it.
Also how many users do you have using the BES?