Could use a friend right now.

Breast cancer is no longer a certain death sentence.

Here's the US survival rates, and the Canadian ones are likely even better:

5-year relative survival rates for breast cancer by stage

• The 5-year relative survival rate for women with stage 0 or stage I breast cancer is close to 100%.
• For women with stage II breast cancer, the 5-year relative survival rate is about 93%.
• The 5-year relative survival rate for stage III breast cancers is about 72%.

Your sister will be okay.