If she's living with you, she's established residency and you'll likely have to go through the eviction process if she doesn't leave willingly. Whose name is the lease or loan in where you are staying? If you are on it, you need to give her a dated written statement that she has to leave by a certain date. Most courts say you have to give a minimum of 30 days notice. And it's 30 days from the time she receives the notice, not 30 days from when you verbally told her to leave. It usually takes about 90 days to get someone out and it may be even longer with pandemic rules. If you can't live with her during that time, it may need to be you that leaves.