You may very well be right, time will tell and all that sort of a thing. At the moment I don't think we know quite enough about how Solstice's power works to make any sort of absolute claim in either direction so I'll be interested to see how it goes too.

If it's mystical/magical, then anything goes, a spell can last without the owner's active involvement, and she'd be mad to have a costume that vanishes when she's unconscious.