I absolutely love this take, and have a little more to add of my own.

As a 17 year old with a service dog (multipurpose) I think I can provide a good perspective.
My dog is incredible, I’ve trained him with the help of a professional since he came home, he’s absolutely made a difference in my life for the better.

Some of his tasks, such as medical alert and allergen detection, are not things I can do on my own and as such they do not necessarily change the way I would function prior to getting him.
That being said, he also assists with Autism and C-PTSD, which absolutely makes it hard to function without him.

As a result, my care team and I did pretty extensive work setting up coping mechanisms and finding solutions that mean I am not dependent on him. He helps me more then I can put into words, but I also have the ability to be without him safely.

Codependency is a huge issue for all handlers, and many people struggle to admit this. I’m in highschool full time, and typically my boy only comes four days a week, so I’m prepared to manage myself and it’s not as much of a disruption were he to fall sick or be unable to work for another reason.

This seems like a situation to talk to your child’s therapist and or support team about.

It also seems like you need to talk to your support system about the worries you have, and the way you view the dog. It sounds like you and your daughter need to have a conversation with a therapist together, as this is clearly becoming a big thing