yes. Gura would become Gawr for one turn kind of like a limited break or a berserk mode in some games. She would not be able move for one turn after using it though. She could also change if her HP hits zero as a last resort move. That's what I was thinking anyway.
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yes, but only after her attack. I don't remember what game it was, but I do recall a last resort attack that happened when a character died. Also FF VIII had a move where one of the character could revive the whole party even if everyone was died, if I recall right. So, the way it would work is her HP would hit zero, she would change into Gawr mode get off one final attack (even if it's the enemy turn a counter if you will) then fall unconscious. At least that's what I was thinking.