Uh, ok, i have almous the same mother, and why did she lock you? See our parents try to tolarate our mistakess but sometimes they just get realy pissed of, for what reason i dont know why, them they also might beat us up or shout at us not knowing how they act, but trust me they feel guilty later on, just wait, try to help your mom, and you will see she might act deferently, that always helps when my mom is angry.

Maybe your mom just wants you to enjoy you life, but is thats why then she wouldent act like that, maybe she is still shooked by your mathers death and suffers from deppresion (i suffer from deppresion, and my mom sufferd from deppresion when she broke up whit my father). Maybe there are somethings she isnt telling you for a reason ,but those things make her realy angry, however whatever is the problem know that im always here and i will allways be there for you, even when offline just remember what i sed, and know you are not alone in this.

:)