Harley gets superpowers.

Harley with powers. What a dangerous premise.

Your options are:

Kryptonian Powers - The powers of Superman/Supergirl. Flight, speed, nigh invulnerability, ice breath, x-ray vision, heat vision, super senses, etc. Vulnerable to kryptonite, red sun exposure, and high frequency sonic devices.

Amazon Powers - The powers of Wonder Woman/Themyscira’s Champion. The powers bestowed to Wonder Woman by Olympus’ gods. Flight, superhumans speed, reflexes, agility, stamina, reflexes, accelerated healing, enhanced senses, immortality (does not age beyond her prime).

Lantern Powers - The ability to summon light constructs like the Green Lantern Corps (or any lantern corps for that matter).

Shazam! Powers - Black Adam chooses to share his power with Harley Quinn.