Hit by an 18 wheeler. Should I get a lawyer?

Hello, my mother was hit by an 18 wheeler yesterday on her commute to work. She has 4 broken ribs and is bruised and cut up pretty bad. Within two hours of being in the hospital, tax adjusters from the drivers insurance company came by to talk to her in her intensive care room. Im not really sure what they said because I wasn't there yet, but it really gets me nervous they responded so quickly. Just wondering if anyone has ever been in similar situations, and if we should get an attorney or just take whatever his insurance company offers. She was hit from behind and it was the drivers fault as well, thanks for any advice.