There are a few things that can affect the Calendar. The first thing I thought of is the possibility she has her DM set up to control the synchronization of the calendar. It is possible to have the PC only send the updates. Check the options using the DM control panel. Beyond that it may be a BES setting but doubtful. It just seems like a wireless sync setting.
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9810 BES Z10 on BES 9700 BIS