Maybe have a look at the CSV file in Notepad and see if it's different at the spot where the contacts become editable(23?). Do the contacts work if you setup her account in Outlook with the connector? If they still work there maybe it's something to do with the connector.
If you still have her PST I'd just attach the PST to your Outlook and then export her contacts to a new PST. Then run the import wizard from Zimbra as the user and it should work fine.
Outlook to Zimbra and Zimbra to Outlook anything can do some crazy stuff, so I'd just go with the flow and take the easy route I'm still a couple versions back though, so I don't have a right to complain really.