WElcome to Purrs - I personally wouldn't get another cat, and a dog might not help matters much either. Sadly, you do get some cats that dont tolerate other cats living with them, and it would be unfair to get a cat for it to have to go back, and if Phoebe doesn't like other cats, it wouldn't be fair on her. If you are broody and have some spare time, you could help out at your local cat rescue. Or sponsor a cat, that way you are helping a homeless cat.