New owner of the nexus 7, had a few questions regarding google accounts and various apps/privacy

My problem: I know i can create a separate user account for her but she is offended that i would want to lock my user environment from her...so i'm stuck with her able to access my user account.

I know i can delete the gmail app if i want and then just use chrome to sign in and sign out to get around that but I just said screw it and left the gmail app on, not that big of a deal.

One thing that i can't figure out though is what to do about the gallery and camera. I hate that you can't unlink the gallery from a google account without removing the entire google account (thus making gmail and other apps worthless). I don't want my picasa photo albums in the gallery and i've removed them but then as soon as it syncs they are back.

I was annoyed so i disabled the gallery app but found that it automatically kills the camera. My current work around is i created a separate google account and linked that to gallery but if anyone wanted to they could go to the settings of gallery and resynch it to my original gmail account and then it would redownload all my pictures again. Again very annoying. Are there any camera apps and image storage apps that work with the gallery app disabled??

Anyways i'll probably end up just removing my pictures from my picassa account. I'm assuming, though i havent downloaded it yet that google drive app would work the same way.

I could use an app locker but then i no longer have the illusion of me trusting her with my accounts.