Just sign in with your ID? That is what I have always done.
Sign out of the app store with her ID.
Click Sign In.
Choose Use Existing ID or whatever the verbiage is.
Enter your ID.
Install Apps and/or App Updates.
Sign out of your ID.
Sign back into hers.
I do it all the time with my work Apple ID and my personal Apple ID on the same computer.
Oh good point. I guess I don't have to login to my profile...