Take a look at the original sentence again:
Carla has difficulties getting to her 8 a.m. English class on
time, she always watches too many late night
movies and then hits the snooze button on her alarm once too often.
You wanted to fix it this way:
Carla has difficulties getting to her 8 a.m. English class on
time, because she always watches too many
late night movies and then hits the snooze button on her alarm once too
often.
By placing a because in front of she always watches, you subordinate what was a main clause. This method is a legal move in writing. There is a problem, however. When you attach a subordinate clause to the end of a main clause, you seldom need a comma. The comma before because is the problem with this choice.
You might want to consult the rules for fixing comma splices and fused sentences.
Go back to the sentence to try again.