I'm sorry you going through this. I'm sure it's not what you expected when adopting her. If you are feeling so overwhelmed why don't you give her back to the rescue group till she's well enough to come back to you. That way you won't have to worry about your daughter or your cat. Hugs
So today is the funeral for my daughters ( she's only 14yrs) best friends brother. This is going to be the hardest day of my life as a mother. I just hope I can be strong enough to help guide my daughter through this difficult day.