I agree with Catty1, it sounds as tho' Leila needs to be the only cat in the household.
I once took in a beautiful girl named Dandilion, she was living in a mobile home with 3 dogs and a baby.
Dandi never adjusted to being in my home with 3 other cats, there were constant fights and peeing on the stairs and other issues.
My daughter had a friend at college who needed a companion, and she fell in love with Dandi and they lived together in peace and harmony for many, many years. ;)