Not her timeline, but you being dead is going to save my little town? [Isolating himself, again. This kid really did want Cloud to just tell him that Jenova is like, weak to fire or whatever, and then bolt.] She's Cetra. Maybe her mom's still alive in your time, in which case you should be asking her first, but if you don't then you need to ask Aerith since she's the only one who'll actually know what the Planet will and won't allow.