How to remove an old account from current App Store. Will not allow me to update apps without password.

I had previously logged into the App Store with my mother’s information and now have my own. Unfortunately, I can no longer update apps since my App Store still requires me to somehow log into my mothers account and I no longer have the information. How can I have her account permanently removed from my phone? I don’t think I have anything on my phone that is connected to hers anymore.