I would definitely probe further into her leaving her current provider. As far as her asking how many children...could you give general info about the DNA. Like "I will only care for a maximum of 5 children at a time to stay in line with the daycare act. If she will be your only client come Oct then I think you do need to be up front but if you have a few children starting then you could tell her the amount of children you'd have come Oct. Try to talk with her over the phone instead of email. It's easier to get your tone across and have a easy conversation. Good Luck.