So Ooi is/was draining energy from the Admiral for the powerup which she can't control anyway. Yeah, that does make a decent reason not to wear the ring for the time being.

Though before translation of the rest of the chapter I have to wonder if this is common or not for the purposes of the story since there was no mention of it being a trial run of the thing, and if it's a common enough process something like this should have come up before.