I hope she doesn't keep following it now that you have sold it, or you will never see her again!
A bit like me, my dog and squirrels - thank God we never introduced them along with all the other 'feral' vermin we imported from the rest of the world. The list is enormous - Foxes, rabbits, hares, European carp, Redfin, donkeys, horses, camels, more than 6 species of deer, Canetoads, fire-ants, prickly pear, lantana, privet, etc etc. The Indigenous inhabitants would no doubt include (with good reason from their perspective) post 1770 people!