How can I remove safari data from shared iCloud account?

Before iOS 8 and family sharing I was using a single iCloud account shared among several Apple devices in my household. Now that we are all using our own separate Apple Accounts I want to delete shared data from other devices that were using my iCloud account. For example, my wife and I both have data synched with iCloud (the same account) for Safari. Now that her phone has been switched over to her own AppleID, I want to purge the data stored in my icloud account from her device. When I open Safari on my phone, I can see a list at the bottom of tabs that my wife had open on her phone at one time in the past. That list will never get updated now that she is using her own account. So how do I purge old data from other devices off my iCloud account?