She seems to be guilty of stupidity though more than anything else. Why should she go to jail? Prison should be for violent offenders and people who are a danger to the public. Lyndsay just seems to be a danger to her own career!
Obviously she is no saint but there are people doing a lot worse.
If she drinks and drives she is a danger to the public, and the fact that she hasn't killed anyone yet is likely to be solely luck. Indeed, a drunk driving celebrity who doesn't kill anyone is a danger through the bad example they set to others, as other drivers might be encouraged to think they'll be as lucky.