I feel so sick.

My little sister’s BFF drove drunk yesterday afternoon and killed two little kids and seriously injured two other kids and the driver. BFF is in a coma and likely lost a leg—and will be lucky to be alive if she makes it through. Assuming she lives, BFF’s facing serious, serious prison time, along with the crushing guilt of having killed people. My little sister is devastated.

What do I even say to my sister?