Can we pay expenses for a birth mother in an adoption?

My wife and I want to adopt and we’ve been approached by a woman in our church who is pregnant and cannot keep the baby. She is not in a good situation financially and has asked us if we are able to assist her with expenses. If we do not, she will need to leave Sacramento and go live with her parents in Seattle during her pregnancy. We do not want that, we prefer her to be close by so we can monitor the pregnancy and attend doctor’s appointments with her. We think we are legally allowed to pay for her medical expenses for the birth, but does California law permit us to provide her things like rent and food? Should we have some sort of contract stating the terms of the adoption? We are Filipino and so is she, so it’s important to us to work with a Filipino lawyer if we do need one.