I don't know if this will be any help, but I thought I'd throw it out there anyway. My mother-in-law was a nanny for years. She was first hired by a couple in her church. She was actually working in the preschool and the couple liked her and asked her to quit the preschool and come work full-time as a nanny. She did and loved it. Some of their friends were wanting to get a nanny and they asked her if she knew anybody. She recommended a friend and she took the job. Maybe this will give you some ideas of finding one.
My mother-in-law lives down in Brandon and has been looking for part-time work. She was let go by the family when their kids started school. She's been looking for a job, but would prefer part-time. So if you'd like to talk to her, let me know. I don't know how far away you are from her so I'm not sure if that would be an issue or not. I know she can provide you with references.
L.