2000 Chevrolet Blazer tires problems

A chunk of approximately 2-3" blew out of the sidewall of the rear passenger tire. My daughter was driving, and she lost control after the tire blew and hit a tree head on at 45 MPH. The vehicle was totaled and my daughter has multiple injuries, including a fractured kneecap, sprained jaw, disc protrusions at c6/c7 and l5/s1. She is having headaches and facial pain and a brain mri was performed yesterday. We'll have those results sometime next week.

Tread separation on two uniroyal laredo p235-70-15 on a 2000 blazer tires, with-in a 10 day period. Apx. 10 days ago front end was shaking, told of tire separation on l/f. Tread was separating from tire . Bought 2 new tires. Today I had tire separation on l/r and again tread was pealing from tire. Called uniroyal today and after three phone calls of getting the runaround I was then able to have one covered under warranty the other tire was disposed of by tire shop. Tires had about 60-65% tread life left on them.