I've originally pencilled this piece months ago and forgot to finish it.
The original Kid Quantum, James Cullen of Xanthu, joined the Legion of Super-Heroes during its first week. His ability to generate stasis fields received an artificial boost from his stasis belt. During the Legion's first mission, he died battling the alien entity Tangleweb, his malfunctioning belt partly to blame. This tragedy prompted the Legion to deny membership to those whose powers relied on external devices. Before long Jazmin Cullen, Jamie's sister, joined the Legion. As Kid Quantum II, she wielded the same powers as her brother, but underwent experimental surgery to augment her powers instead of relying on stasis belt. The radical surgery boosted her natural abilities to project time and reality-altering status fields.
I found this background at www.hqwally.blogspot.com, the colors kind of match her outfit.