She may be skilled and adept, but since she has not been to medical school, she may not have received the right information, regardless of how talented she is. She is not a professional so she has a higher chance of messing up.
Catherine should receive professional help from someone who has a medical degree and has all the certification required to assist childbirth.
Of course, this is if Catherine can afford getting professional assistance. If not, she should take help of the woman that she knows.