I Messed Up My Sister's iTunes...please help!

When I didn't have access to my own computer, I used my sister's macbook to update the OS and backup my ipad. She had never used her iTunes before, so I signed in with my apple ID. Now all of my apps are on her macbook. (I didn't have any music or videos--only a lot of apps.) She just bought an iPhone, and now she wants to use  iTunes, of course, and purchase her own apps.
She tried signing in with her own apple ID, but all of my apps still appear when she does. And the few apps she downloaded also appear, interspersed with all my apps. I searched for a solution to this issue, and the only answer I can find is that she would need to create a new user account on her macbook and download another itunes to it, and sign in with her apple ID there. However, she does not want to do this--too much trouble to switch users everytime she wants to use itunes. She wants to delete all of my apps from her macbook. I have since been able to access my own computer, and I have once again updated the OS and backed up my iPad to my own computer.
So, my question is this: if she deletes all my apps stored on her macbook, would it screw up my itunes account? (Since they are already backed up to my own computer...)  If I de-authorize her computer from my itunes account, would this solve the problem?  I just want her to be able to have her own iTunes account on her own macbook, but not mess up my itunes account.
Does anyone know how to fix this?
Thanks...

On her computer...
Launch iTunes.
iTunes prefs > Devices and delete all backups.
iTunes menu Store > Deauthorize computer for your account.
Quit iTunes.
Delete the entire /Music/iTunes/ folder.
Launch iTunes.
iTunes will start up empty.
This will not affect your account at all.

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