Huh.. Most likely right. The thing is when I was watching her videos and they would end with j.D and she would shine for a second I thought that was each level up. I saw it occur twice in a row in one of Digital's videos so I thought "oh I guess the max is level 3". But looking back now, only seems like there's a Lv. 1 and 2. I think the shining effect is indeed her going from Lv. 0 --> Lv.1 or Lv.1 --> Lv.2. But for it to occur during Lv.2 as well, maybe it resets her Heat Up time? Like she gains another 10 seconds of being in the mode.
And thanks for the correction.