Her job is to clean for you!!! Not lecture you, or make demands upon you! I do not like some of the comments she has made to you. She has boundary issues.

I can't believe she left the oven on... I hope that it wasn't a very nice pan. If it is, it's stainless steel, and SOS pads won't work, you can try to clean it with oven cleaner. If you decide to keep her on, keep the pan as it is in a trash bag and leave it for her to clean until she comes again!

You can call the office and let them know about the demands she is making and ask them to send someone else to avoid any confrontation with her, and hopefully they can find someone who is a better fit for you