Unlike with giganteas I've never had much luck treating crispas so I would be careful with that. My current crispa has done the deflating-inflating game for a year and it is most definitely not disease related (no gaping mouth or expelling of matter) as it is usually with giganteas. I found crispas to be much more sensitive to all kinds of environmental conditions (heat, light, water quality) than giganteas. Deflating of crispas is IME usually a reaction to some parameters being off rather than disease.
Keep an eye out for slightly brown spots that indicate Zooxanthellae. If those exist then the anemone has a good chance of regaining color. If it is still totally white after a month or two then it likely has no remaining zooxanthella. In that case it would need to acquire them from another anemone or corallimorph like a mushroom, zoa,... ideally via direct contact.
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