Apple ID and ITunes account dilemma?

When I first set up my iPhone, I used my mother's account. She has changed her password. I created a new iTunes account and Apple ID, inputting all my payment info and such.
When I go to settings>iCloud, it proves my info at the top, and also when I go to settings>iTunes and AppStore, it shows my ID at the top, and when I click on it, all the information is indeed mine.
I go to buy a song, works great.
Yet I go to update an app, and it prompts me for my mother's Apple ID password.
I have reset my phone.
Other than that I'm lost.

Your phone needs to be setup with your icloud account