So me and my girlfriend have been together for 2 years in university so far. Just recently, about 2 months ago, her mother was diagnosed with cancer from her dad's chain smoking, so technically both her parents have cancer at stage 3-4.
Take it as is? Support her while she goes through some very rough times...
I agree with >>2. Just give her the most love and support you can. You can deal with problems when the time comes, but until then there's no use worrying about what may happen.
She's going to have to deal with both her parents deaths and then suddenly running a corp? Well, you're going to have to give her all the emotional support, and otherwise, that she wants, and needs. I stress the wants part because she'll want her own time to grieve too, probably.