A few things to take away from all this:

First, keep unwanted breeding in check, no matter how limited the potential. Murphy's Law is universal.

Secondly, I'm to assume that your local pet store isn't going to give you a cert like AKC, CFA, blah blah blah for bloodline on a Garter purchase. So buyer beware. Sticking to WC or a reputable, trusted breeder is best practice.

Thirdly, and perhaps most importantly, Tina was forthright and honest about her mistake. Kudos to her! So, let's reward that by trying to help her find a sollution she can live with.

Lump