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.
...This.It's just that... It'll be bad for the both of us if I wear this all the time...You should keep it.And from that, I came to know that married shipgirls derive powers from their admirals via the ring from the provisional marriage.It seems that the admiral doesn't know of this either.Nm? The hell...?I-it's not like I'm returning this, okay!? Don't get the wrong idea.Ah... Is that so...