I have two ideas. The first one is: you need to find a way to get the passwordof keylogger account, then you can watch the log history, you game accounts included. And after getting your passwords back, you can delete the spy software completely.
But some keylogger is undetectable and it can run stably. So your mom knows all your activities. And I think you can install a keylogger on your mom's computer, and you can know all her activities, including emails, passwords, keystrokes and so on. If you don't know how to install it, aks a computer whiz to help you.
Good luck.