Not happy with her nurse?

We currently have a nurse/caregiver coming to our home once a day, 5 days throughout the week. She is meant to help my mother-in-law take her medication and do general check-ups. My husband and I both work and have a teenager to care for. She tells us that the woman is very mean to her and treats her like a child she doesn't want to deal with. To my husband and I, the woman is very professional and kind. She keeps insisting we get someone else but no one else is currently available for the schedule we need. Is there a way around this? Will we have to find a new care provider through a company? This nurse comes from the local hospital.