My Mother has overnight personal care workers paid by Medicaid. Why are they only paid for two hrs. of care when they are there all night?

My mother in law is 98 yrs. old, of sound mine and wants to stay in her home. she has Medicare and recently added Medicaid and currently has SDS/Family Care managed by Community Care Connections of Wisc. She has Personal Care Workers that come between 10-11 pm and stay all night with her. They are only paid for 2hrs. and do not get mileage to and from her house. Why aren't they paid for all night and mileage in Wisc. Thanks Katie