That is nice of her to let you know that it is a possibility. If I have no other families lined up then I would offer her the spot. I will at least have the income until February. You never know she my end up not moving and staying with you. And this would also give you enough time to advertise.

I have someone contacted me in February asking temp. Spot for May. I was looking to fill my spot then and told her to contact me again near the time to see if I still have the spot. I filled my spot and she did contacted me in April. By that time, I was looking to increase my ratio to 3 so I offer her the spot. And I found another family to fill their spot when they leave. So it worked out great.