I have been renting from a roommate who is renting from a landlord. When I moved in, I gave her last month's rent and a security deposit. On Feb 20, I gave her 1 month notice that I am moving out. I have paid March rent (even though she has a last month rent) because she is having financial difficulty and I am helping her. First, she says I am responsible for rent to March 22 since Feb is a short month (she is counting 30 days). I think I am responsible until March 20, 1 month after I gave notice--calculated as rent is each month no matter the length of the month. Which is it?
Also, how long does she have to return my last month rent and security deposit as well as the extra days I paid for in March?
Thanks for your help.

