I guess I'm confused. You have plainly stated you are not in this to "change" anything and that you have found a use, even if not what someone would say is conventional. She gives you warm feelings and you appear to find some things easier with her support. To me this all sounds like a good attachment or relationship.

As well even if some of what she does is because she is paid then so what? You enjoy it and she helps. It's possibly a better relationship than friends, why not enjoy it as it is?