talk to her about it like, sit her down and discuss and go over the rules with her this is your house and you need to discuss the terms with her if she's gonna stay here if she doesn't want to evict her
1. Set ground rules 2. Expect her to help with upkeep if she's living there 3. Since she CLEARLY has a job, start making her buy her own groceries or have her give you money to get food --- If she refuses either kick her out or refuse to let her refrigerate her food.