It must be scary not knowing what to expect since you have been estranged from you mother for some time. The good thing is that you are there with her now as she goes through her
breast cancer treatment. The good thing with modern times is that you can find a wealth of information on forums like this. I am in your shoes. I am new to all this and have been trying to read up as much as possible to understand the whole process. Keep your spirits up, and I am certain your mother is glad to have a relationship with you now more than ever. You are her support system and everyone is here for you.