Chrono had fallen asleep, he wasn't needed, and the High Crusader was probably trying to get over whatever shame she had after losing.
The Crusader, however, had gone to her room to sleep, hoping her dreams would put an end to her shameful feelings for just a brief moment at the least. When laid down on the bed and went to sleep, part of her that was suppressed by the white fire, had surfaced and took control over her form. A black ring appeared around her eyes, then ignited as it 'burned off' the white of her armor, and condensed the armor to the point where it looked nothing like the High Crusader armor, then her mane lengthened before turning gray, and was tied off by a ring of black fire. The 'new' dragoness got out of the High Crusader's room, and sauntered through the halls, carrying herself like royalty.