You can connect the device to Desktop Manager and clear just the address book database. What I would recommend instead is doing a Security Wipe. Go to Options >Security Options >Security Wipe. This will wipe the entire device of all your settings and data and you can start over. It would be a good idea to get her own BBID for downloading apps & games, etc. Each BB user should have their own BBID. New versions of BBM use BBID so it's not a good idea to share BBID.
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