Nah, I'm sure she's fine. They just didn't show someone recovering her. The delmos are shown to survive some pretty rough stuff, characters are totally fine after really brutal hits. We're not supposed to worry about the delmos, otherwise it'd be a totally different show. Aika gets away with making them really cute, letting us get to know them, sexualizing their defeat, and keeping a fun upbeat tone most of the time by making violence against delmos basically consequence-free. Making poor pink headband die offscreen with no fanfare or any sort of meditation on what it means for Aika to punch and kick these girls would just be incongruous.