I understand the occasional early drop in or random phone call in the first week or two, but by 4 months there should be a much higher level of trust. She needs to move on to someone else.
Sorry it's not working out, it sucks when we go to all of this work to transition a child only to have to terminate once they become comfortable. Then you have to start all over again.
No one needs this kind of micro management, especially when you work for yourself!
All the best finding a client to fill the spot.