I reckon she'll manage to get in the litter tray all right. After all, they can climb up the curtains and get into all sorts of mischief so a tray won't cause many problems! I don't know much about attractants - I've used Feliway spray with no success whatsoever for other problems, though other people swear by the stuff, but I'm not sure if that's what you mean. Both cats I tried it on just studiously avoided the places I sprayed, which is the opposite of what it's meant to do. I'm not sure how to clean cat wee off mattresses either, I'm afraid, I remember the duvet was completely soaked (Squeaky was a big kitten at the time) and we had to throw it away, luckily my husband was between the cat and the mattress so he got sodden too but the mattress stayed dry. We had a nightmare time with Squeaky, it reached the point where we thought he might have to be an outdoor cat because we just couldn't cope with his dirtiness, but then we hit on the idea of keeping him closed in the kitchen with a tray overnight and it worked fairly quickly. He was a clean cat for the next sixteen years, till we lost him to cancer.