Sounds like to need to set some rules and some boundaries quickly. Tell her that the singing and loud talking is invading your right to quiet, and set some reasonable times for her to do this, or have her take it outside away from the home. Set some limits on bathroom time. Definietly do something about leaving the doors when no one is home unless you want to come home to all your personal belongings having been stolen.

As far as her critisizing how you eat, your religion, and how you exercize, that's really crossing a line, and is none of her ****ed business.

I'd confront her about these things as soon as you can. Otherwise the next 8 months are going to be a nightmare. It almost sounds like she's not even aware that you live there. Set her straight and get some respect!

I hope this works out.

Greg