Casual App help

Gryffendor Gamr

Skeletron Prime
I'm trying to get something for my mom but I need to get a app to get it. Now i'm going to get the app on Google play but if I download it will it show up on my mom's phone that I downloaded the app or b/c its on my account will it not show on her phone. If you know the answer can you please help?
 
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