Assuming this information is conveyed, Peridot's next move is to pull something out of her hammerspace gauntlet and offer it to Rita: It's the healing draught that Five gave to Peridot as a Solstice gift.

She'd prefer if they didn't have to use up her "super useful and rare potion" if at all possible, but if no one else has any method of healing she'll gladly give it up for the cause.