Losing a testical or breast and then having a 1 in 5 or 1 in 10 chance of survival afterwards is a big deal. A crazy big deal. On your board of "no big deal at all" cancers.
My mom had bowel cancer 6 or 7 years ago. She is ok now. But that is lucky.
A great cancer is a really low growth skin cancer on a 90 year old caught early. Breast or Uterus cancer in a 35 year old woman is awful. She might or probably will survive. But no more kids or maybe breasts with a "great outcome".
There is no "not a big deal" cancer in a 35 year old woman with a 1 and 4 year old child. Doen't exist. Even if it is the absolutely best case scenario over every part of the journey...the phrase "not a big deal at all" is not a phrase anyone ever is going to feel or say.
Even the best possible case scenario is beyond traumitizing. And will lead to fear and worry until everyone in the family passes on.
I was only putting the testicular cancer in the "no big deal" section because if it has not spread it is no big deal. (99% survival rate)
Melanoma, Breast, and Uterus are a big deal but assuming it has not spread your 10 year survival rate is 75%+. Those are the top 3 "desirable" for common women cancers. No cancers are going to be fun but they are different degrees of bad. I am going to go ahead and hope she has one of those 3 and not one of the three truly bad one like Pancreas(1%), Lung(7%), or Brain.(14%)