Could you borrow a dog crate or kitten pen from somebody and keep her inside when your own cats are in the same room? Perhaps buying a second hand crate from someone would be cheaper than your friend paying for a cattery, and would be reused each time your friends goes away on holiday anyway, so it's a good investment.
If it's going to upset your own cats, don't do it. If you have a room she could stay in (like a dining room or a bedroom) without your own cats meeting her, that would be ideal.