Cannot log in to a different Facebook account

[calem_s_r]

My mom and I both have Spotify accounts through Facebook. I briefly signed out of my account on my phone and into hers because she has premium and I wanted to play a specific song. But when I tried to sign back in to my account it will only let me sign in to hers; when the in-app browser comes up it won't let me switch accounts but will only direct me to sign in or to a help menu. I deleted Spotify and downloaded it again (from iCloud) and I am still having this problem. How do I get back to my own account?

[calem_s_r]

Update: apparently this is my mom's account I am currently using and put my name on as the username. I am posting via Safari, where I should be signed in to my own Facebook account, so this is linked to Spotify in general not just the in-app browser.