Gina, if Lexi has a little accident ... so what? Pee and poop can be easily cleaned up!
I have leather couches and my dogs jump all over them ... trust me sweetie, their nails aren't sharp enough to scratch it! How could his mom dislike Lexi? All you have to do is look at her little face and you're in love. So don't worry about it. Everything will work out fine. If you ever need someone to watch Lexi while you're away, you know you can always count on me.
Don't worry about anything ... just go there and have fun!!