No, you should try this. Granted, Sophia can't breathe at all at the moment, so be calm and relaxed as you speak with her.

No. You should definitely encourage her to relax, and reassure her. If this is Sophia's first solar plexus spasm, she's likely to be very afraid and unsure of whether her breathing will return. Keeping her calm will give her system a little more time.

Sorry, no. Loosening constricting clothing can help Sophia as she recovers her ability to breathe normally.