I don't agree with her about multi cat households either. I can see where she's coming from, and I do think a lot of feline unhappiness arises from cats being forced to live in close proximity to other cats that they don't get on with, but cats are much more social than people give them credit for and many cats benefit from a feline friend. With multi cat hholds I think the important thing is to have enough space so that they can divide themselves into 2 or more social groups if necessary, and not be forced to live in close contact with another cat they have problems with.