Kelly,
Sorry about the lack of care. While I know they all survived, and throw up CAN be because of poor care, also note that Micah might have been upset that you were gone. Tex will sometimes throw up for stress reasons. The dirty syringe is unacceptable. The food put away without knowing if they all had a chance to munch at their leasure is unacceptable. The kitty litter, well, some people aren't as fastidious.

I learned last summer that you have to have good care. Mom is really my only choice- close to me, and loves the pets like I do.

NOW, TODAY, start looking for a kitty sitter. Call some local vets, groomers, and get some people looked over. Don't wait for the week before the trip. You, too, deserve some time away, and you won't enjoy it if you know your kitties are getting less than the great care you two provide.

No point in bringing it up to your friend. If she cared, she would have done it differently...and you telling her your feelings isn't gonna change anything. Just know that this is a people friend only, not a pet friend.