I understand your dilemma. Ive had parents go on mat leave but the continued with full time care for the older one so they didnt lose their spot and also to give them the time to bond with the new baby without the demands of a toddler. I think tht if it will be a financial burden to lose the income that you should fill the spot. If you do continue with part time you may find that in the end you dont get the little one anyway so it will have been a loss of income for no reason. On the other hand it may be hard for her to find one person to do both school aged and infant care. I personally dont think that school aged kids are a good fit for a home daycare that has wee ones a well.