Would you keep or kick out a slow-witted but kind NANNY?

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Here in the Philippines, a nanny is called YAYA. She stays with the family and is often left to care for the child the whole day. My son's nanny has been with us fro a month and a half already. But I am not very comfortable leaving her responsible for everything that concerns my son. You see, she is quite slow, figuratively I mean. She has to be reminded about routine tasks. I have tried posting a list of tasks and a list of reminders on the refrigerator door, but she still forgets. I can't trust her with giving my son's medicines because she bungles up the dosage and frequency. BUT---she is very kind to us and more improtantly, to my son. She is good-natured and has a sunny disposition which rubs off on my son. She is too ,ind, perhaps that my son might end up spoilled. But she has a very good heart and i see that as a very big plus factor. If you were in my shoes---Would you keep her or kick her out?