Might have to kick Roommate out soon... can I legally change the locks?

If you gave notice on September 1, then you wouldn't owe the landlord for the month of October. Your 30 day notice should also be in writing. If it was verbal, even if she tried to sue you, it is one person's word against the other.

She has no case.

No, she's not entitled to more money. You gave notice at 1st of September that you are moving out on September 30th. You've already paid up for the entire month.

So it doesn't matter if you left early or not.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.