I have had this happen twice to me while doing in-home daycare. Both of the infants were about your daughter's age.
Here is what I found the problem to be:
a. I was watching too many children and our setting was not suited to the child.
b. The infants wanted to be held more than I could. Don't get me wrong, I did hold them and I loved them like my own, but I could honestly not get everything done,by holding them all day.
c. The children were used to being fed by someone else, I don't feel that the parents worked with me enough to share what their 'routine' was at home.
Consistency with infants is important. One day a week might really be jolting her out of her normal schedule. You might think about having someone come into your home for the one day. That way she is not being 'thrown' into a situation that she isn't comfortable with. She obviously is in distress and the situation is not working out for you or her. The one infant I had cried for five hours off and on and the other one cried the entire time. I held them, rocked them, loved them, tried to feed them and nothing seemed to work. I have a ton of experience with infants and I was at a loss as to what to do with these children. Yes, both parents took it personal when I said that it wasn't working out, but it was in the best interest of the child. One day a week just isn't enough time to get used to the situation. Try more days or I would suggest finding someone to come into your home.