Unless it's straight up magic a la, like, Cardcaptor Sakura, or something a la D.Gray-man, she's copying it, especially if it's unknown-mutated-gene-related since that's what NEXT powers are based off of. It still has the one-power-at-a-time effect, plus it going haywire when she doesn't keep her emotions in check. Soooo I guess she'll be copying Lea's power huehue.