It's not a question of whether or not she can use her powers with them, why couldn't she use them? Her power is theoretically limitless.
No, it's far more primal than that. She explained it here:
https://killsixbilliondemons.com/com...-167-to-4-168/
The prosthetics Jadis gave her made her return to a state she had left. But it's a trap, she cannot move forward if she lets others carry her backward. Her whole scene is about staying true to her nature even if that makes her suffer. Rejecting the bionics is the ultimate expression of that.