Many times their power to channel electromagnetic energy is referred to as a muscle that they flex. I have an in universe theory for Lorna's power increase that we didn't see in Dark Seduction after she came back from Genosha. She spent weeks to months with her powers channeling the memories of the dead mutants. It helped to get rid of some of the fears and barriers she had to using her powers as she was textually said to always be holding back and was certainly holding back in that fight. It also exercised her muscles so to speak. That is the best in universe rational I can come up with for her power leap we never really saw on Genosha, but saw after.
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