When she does move to the Mac, it will be easy (assuming this is to print labels or envelopes)

1. Open Address Book, and go into Preferences to set up google sync
2. (Optional) Add all the people for the cards to a group
3. With the people or group selected, go to File - Print, Click the down triangle, then pick envelopes or mailing label. Make sure to set the options for the types of labels or envelopes being used.

I've been using this method for a few years when my grandfather needs to send out a lot of invitations to a tournament he runs. He normally gets a spreadsheet with all the names and addresses, and we first export to CSV for import into Address Book.

For Word and Excel, I always forget the steps offhand, but it should be in help under "Mail Merge" for all the steps there.