To remove her stomach seems like an over-reaction. Liquid nitrogen quickly turns into a inert harmless gas (80% of the atmosphere) and I doubt that in a shot there could be very much. Yes it could burn but burns can heal on their own.
Liquid nitrogen is commonly used in medical practice to destroy tissues (such as warts or premalignant skin lesions). A small amount is VERY efficient at killing tissue
quite rapidly. I have no problem believing this woman suffered severe injury
I dont think it eas entirely the cold. The expansion of the nitrogen probably burst or damaged her stomach. I wonder if you could use it to peoduce extremely long and forceful belches. I’ll let someone else try first. Lol