How to unlink two apple account?

I just downloaded ios 7 on my iphone 4s, and since my mom and i share the same apple account, i have all of her contacts on my phone but no pictures and occasionally i will receive a text my dad sent to her. How do i unhook her from my phone? Do i have to do a complete reset? If so if i fully reset it, will it delete her stuff as well?

Go to Settings
iCloud
Unselect everything on her phone. Also, on her phone, disable iMessage. Then create her a new account. Log into iMessage, FaceTime and iCloud on her new device and then go to iCloud
Backup
And Backup her phone

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