Duplicate iCal entries after sync

My sister just bought a Verizon iPhone, and did a sync using iTunes. Her iPhone is fine. But her iCal now has duplicate entries for every date. First off, how do i clear all those out, and second, what do you think went wrong?

How long has she had the iPhone?
Did she sync the iPhone with iTunes right away before manually entering any calendar events on her iPhone, or did she manually enter a number of calendar events on her iPhone before syncing? If the latter, are only the calendar events she manually entered on her iPhone duplicated in iCal on her Mac? If so, how many calendar events was she able to manually enter on her iPhone before syncing with iTunes and iCal since she purchased the iPhone?
If iCal is used - iCal includes calendar events and so does the iPhone before the first sync for this data, a merge prompt should be provided with the first sync for this data. The other option is replacing whatever calendar events are available on the iPhone with what is available in iCal.
First step, reset the sync history on her Mac, which is done via iSync preferences with the iSync application.
Next, remove all duplicate calendar entries in iCal on her Mac. Certainly there can't be that many calendar entries that were manually entered on her iPhone before the first sync with iCal.
When iCal is cleaned up - all duplicates removed, under the Info tab for her iPhone sync preferences with iTunes below the Advanced section at the bottom, select Calendars for replace info on this iPhone. Select Apply followed by a sync.

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