Lifetime driving bans in cases like these make sense. She's been banned before for similar crimes, hasn't learnt.
There are too many cars on the road. And too many drivers see the risk of speeding as merely a fine and a few points. Kill two birds with one stone and give lifetime bans for people who have shown that they can't, no matter how many chances they're given, drive legally.
The legal system seems unfairly balanced towards the belief that people have a right to drive. They don't, they earn the right to drive and like anything that you have to earn it should be removed if you prove yourself not worthy.