I'm going to tell my friend that she can't accept compliments
What makes you want to say this about your friend?
If she can't be subtle about it, I also won't.
Be polite about your criticism and don't be so judgmental. Most of us have some level of discomfort with conflict, especially when we have to raise concerns, assert boundaries, try to respect our own feelings and at the same time are afraid of upsetting the other party.
Nah, I will take this to a manager and make a big deal about it.
It is going to make the situation worse to bring in a third party. Let your friend enjoy the compliments, its not hurting anyone.