Legal for self-defense?

Some months ago, my daughter fought-off an attack with pepper spray. It worked (meaning that the guy ran away), but in the process she got a face-full of it herself. Now, prompted by a similar incident that happened recently to a cousin in Eastern Europe, she wants to know if it is legal for her to carry a small bottle of sulfuric acid in her purse, and hurl that in an attacker's face/eyes (only after he has actually started to physically attack, obviously), as the cousin did, blinding and scarring the ailant?