Two Weeks Notice

[FSD]

I have a question for you experts. Since I've opened, I haven't had to deal with any kids leaving until now. I just got notice that one of my dck will be leaving to go to a preschool, and they gave their 2 weeks notice (last day will be June 26th). When they signed on with me, they gave me 2 weeks deposit to cover for the last 2 weeks of care. But they are, as of now, paid up until the 19th of June (pay was last Friday for the following 2 weeks). My question, do I now owe them a week's pay? Apparently they've known he was leaving when they paid last week, but decided to wait until today to tell me, so this seems to have kinda screwed things up. This also comes at a horrible time since my hubby has been out of work and we SERIOUSLY do not have the money for me to pay her! Any advice would be helpful! Thanks.