How can I start clean with Contacts?

My iPad3 died under warranty and was replaced with an iPad4. Before I had a chance to really use it, I loaned it to my wife to take on a business trip, supposedly just to access her webmail, Facebook, and maybe take a few photos. Somehow, she managed to import 300+ contacts - seemingly from her Android phone, but maybe from Facebook... she has a lot in both places.

I discovered the problem when trying to share a video on my own Facebook timeline. I was logged in to Facebook in Safari, but the video wouldn't upload via the Facebook UI (I don't use the FB app because it has 10 times more ads). So I shared the video to FB direct from iPad Photos, it shared to her timeline, not mine.

When I go into iPad Contacts and look at her contact record, it says "Me" beside it. Somehow she did something so that iPad Contacts thinks the iPad is hers.

I want to clean out ALL contacts in the iPad and start over. But I don't want to just go to a new iPad and wipe out everything I added before I discovered this problem... apps, etc. And I don't want to try syncing with my MacBook to get my own 50--60 contacts until I understand what will happen. I don't want her 300+ contacts ending up on the Mac! This iPad has never been synced with the Mac, so I can't just take it back to a previous sync.

Advice much appreciated!