I update my contracts once a year and usually there are some changes. I don't give the families any vacation time and fees are due for full weeks every week unless I'm closed for my vacations. I wrote 3 paid personal days into my contract so that I can still be paid if I have to take a sick day which never happens anyway, but it's the chidren who make me sick.

A month or two before I renew the contracts I draft a letter for all the parents advising them of upcoming changes and asking them to speak to me if they have any concerns. Nobody has ever had a problem.

I think that if you are going to make a change to your contract the keys are 1)advance warning 2) fairness and 3)having families in your care who appreciate all your work.

Without knowing any more of your details I want to say that you should tell this parent that you have made the changes because it is best for your business and find a way to earn her respect and let her know that you have a waiting list of people who would be happy to take her space!