Please tell her not to feel bad at all and instead have a really great laugh about it as we had...I thought it was so funny, but I didn't got upset about it. I think it could happen to anyone, specially when she is so busy.
I hope she finds a great vet for the furkids. I always love seeing pics of Dexter as well...he is a darling.
PS: I bet you must be right too...the dog must have ate it. Now we have to play detectives and find out which one...LOL