First, please use proper language when asking questions here. It makes it very difficult to read your question when you use words like "dat" and "da".
Second, does your father rent rooms to anyone else besides her? If he does then she would not be considered a lodger and would have to be treated as a tenant. If he does not rent rooms to anyone else then she is a lodger. In that case he would just have to give her a written notice that she cannot continue to use the room and must move out within 30 days. If she hasn't moved out within that time he can have her removed as a trespasser.
If she is considered a tenant rather than a lodger, and if she owes rent to your father then he can give her a written notice to pay within 3 days or move out. If she doesn't move out within those 3 days then he can file a lawsuit for eviction. However if she pays all of the back rent in full then there is no eviction and your father will have to start over.
If she doesn't owe rent then your father can give her a written notice that her tenancy is terminated and she must move out within 30 days. (He has to give her 60 days if she's lived there longer than 1 year.) If she doesn't move out within that time then he can file a lawsuit for eviction.
Under no circumstances should he change the locks unless he has a court order! Changing the locks without a court order is an illegal eviction and he could end up owing her a lot of money.
There is a very good handbook that describes landlord/tenant law in California very clearly at
http://www.dca.ca.gov/publications/l...k/catenant.pdf. I suggest that your father read this handbook if he intends to rent rooms in the future.