Assuming you won't have an opening when she would need to start care then she will need to start with another caregiver. If she is just hanging around at the other caregiver waiting for you to have an opening then she is doing you, her, her child and her first caregiver all an injustice. She needs to embrace the fact you won't have an opening when she needs it and then take any advice you want to give on finding a good match and then putting her whole self into that relationship and not hovering for a spot with you. Use the not breaking the bond that is forming between child and caregiver as one of the reasons for not wanting child to be ripped from first arrangement to be placed with you. Then that takes the pressure off of you too.