Send her a text message- as evidence- telling her you will not be going to stay elsewhere, that is your home, you are on the lease, and if she is uncomfortable with you there, she can go stay somewhere else. If you can, bring a friend home with you to make sure you have a witness, or at least have your phone recording when you get home.

You do not need to leave your home right away, and if she doesn't want to be around you, she can leave. You should also tell her if she doesn't want to live with you anymore, you both need to figure out how to break the lease and you will not be covering the full bills anymore. My guess is that threat alone will have her walking back her empty threats.

And if you get access to the home- the police can help you get that access since you are on the lease- then gather your most valuable items and keep them somewhere safe.

Record EVERYTHING once you are home, until she either leaves or you have a calm conversation.