Paying for Trulicity

Ins co and CVS will not use insurance for Trulicity because my daughter is pre diabetic not diabetic.

Before they denied the insurance she had great success in just one month low dose. She was relieved of the constant urge to eat also urge to drink!

She weighs 340lb so I am willing to pay for Trulicity as I feel it could be lifesaving and get her to where she can have surgery.

My question will pharmacy let us pay for the meds after they have denied coverage?