My sister is 6, almost 7, months pregnant

She has really bloated up and she looks like she might give birth soon. Shes living with me and my wife while her husband, whom she met at a marriage tour, is processing papers and documents so that my sister and the child could go and live with him soon. Long story short, Im the one taking care of my sister together with my wife. My wife and I both have no experience with pregnancy and labor since we do not have a child of our own yet. Just wondering if there are any specific preparations that we must do before she reaches 8 or 9 months? Any suggestions or advice will be appreciated.