She sound like a good sitter, besides her comments regarding your house cleaning. That goes a little too far.

One thing to keep in mind is Livvy may be sad that you are gone and may change her bahavior. I know Noah sure does....my cat sitter said that Noah did a lot of hissing the first day and then was better...but never warmed up to her. I know that when we are gone and when a "stranger" (she's my best friend) is in the house, he get's unnerved. It may just be that.

Have you seen your petsitter with Livvy and Cassy while you are there? Is she nice to both of them? If so, I wouldn't worry about it. Maybe she's just not used to seeing that behavior...although, I don't know why...they ARE cats.

Let us know what you decide. Kiss the kitties for me, I've missed hearing about them.