my mother has been diagnosed with three forms of cancer this past year.

This past year my mother has had three surgery's. Cervical, to remove her ovaries, the first time they went in they only removed one, they said the other looked fine. about a month ago she went back to the ER because she was in excruciating pain, come to find the ovary they left in there was far from fine, or normal, so they removed that one, while they were in there they found that her organs have started to grow on the left side of her body. And they found cancer cells growing yet again. They said they had removed all of the cancer cells. Not to long before this last surgery she found out she had a hole in her lung. Also cancer. Im so confused, my mom looks so healthy, she exercises regularly, and she doesnt look sick.. Why all of a sudden is she having all of these problems?? And why does it seem like im losing her. I mean if you look at her today, you would never imagine something like this has happened to her. she looks great. I guess my main question is. Could there be something my family just doesnt want us to know about my mom? If so, i think i would be more hurt not knowing than knowing. Any advice is greatly appreciated.