I'd probably do it. It was nice of her to be up front with you, so many people hide things like that in fear that you won't take them. At least you know and can start advertising for the spot immediatly. I would tell her that you need 3 months notice and maybe take a last month deposit so she doesn't skip out on you? Just a thought.

I took a client in May that was due with baby number 2 in September. She told me right from the beginning that she would be pulling him and keeping him home during her second mat leave. I took them on anyways and had a wait list for September. About a month into care she decided that she didn't want to loose me, so has made arrangments to hold the space, bring him part time and gave me a deposit for baby number 2!

Sometimes it works out.