i really don't know if she`ll be able to retrieve any of her data there isnt a retrieval app that i know about,
Jail breaking is a process that allows iPad, iPhone and iPod Touch users to run third-party unsigned code on their devices by unlocking the operating system and allowing the user root access. Once jailbroken, iPhone users are able to download many extensions and themes previously unavailable through the App Store via unofficial installers such as Cydia. A jail broken iPad, iPhone or iPod Touch is still able to use the App Store and iTunes.