S.B.
How is this a share if she is working 9-5 M-F for you? That is confusing to me.
I completely agree with TF Plano/Allen. Get with your attorney and have a contract drawn up. It will make things less confusing and messy if everything is spelled out.
If you were putting your kids in daycare you would still have to pay the full day and you should as well with the nanny. Again, that is why a contract is a must. Will you give her sick time? Lots to consider.