Switching from daycare to in home care. How much to pay? Will this have an adverse affect on my son?

My son is 7 months-old and has been in daycare since the end of August. A really good friend of mine, has decided she does not want to return to work and has decided to stay home with her daughter. Her daughter is 3 months old. She told me that she could care for Sammy and her daughter at the same time to save me some money. She will be doing the care at my house and her house. Her house is about a 5 minute walk from mine. She had offered before, but was not certain on if she was going to return to work or not, and her and her husband feel it is more affordable for her to stay home vs. the cost of child care. Anyways, will this confuse my son, by staying home or going to her house vs. going to his daycare? He LOVES this friend of mine, so I know he will be okay in that aspect, but I don't want to confuse him, by changing the care situation. She has offered to do the care for free since I am providing him with things he needs and she is home anyways. I told her, that I can NOT let her do it for free. Since he will be home, I can see him between my cles and work schedule. Between my daily schedule and his dads', she will be caring for him about 6 hours a day and 5 days a week. I told her that I wanted to give her $45 a day to watch him. She says that is way TOO much, but I can't help but think it's too little? Watching children is NOT an easy task, especially when you have your own to tend to also. That is still a lot less than daycare. Is $45 a day for 6 hours too little? What would be a good amount?