I didn't really want to report her, have her know we've reported her then it fail anyway
That really isn't the worse outcome you could be looking at.
You really don't want to be looking at the picture of her going into court to face the widow and mother of a child with life changing injuries and to know you failed.
Failed to wave the red flag that there was a driver so incapble of understanding the dramtic and horrifc consequences of leaving her brain at home when she got in a car that she devastated the lifes of people who were merely going from A to B with no idea that today was the day when life, or life as they know it, was about to end forever.
I understand your hurt, anger and continuing pain at how she has behaved towards you. BTDTBTTS. you have my heartfelt sympahy and I know it isn't something you "just" get over especially when the ramifications are an ever present diffiucult part of your now.
But if how you feel about what she did to you is standing between you and your ability to work out what the priority is in this context then it is time to accept that you need to start working on recalibrating the degree to which you allow it to dominate your thought processes.
She hurt you badly. She let you down badly. She impacted your life badly.
Don't let her do so much worse to somebody else.
Not when you have the opportunity to at least try to minimise her ability to inflict herself on the rest of the population be it the pedestrian or car driving/passenger variety.
You want be sitting there thinking "ohhhh, here is my chilled revenge on a plate". if she hurts or kills somebody and has to face the consequences. You'll be tormenting yourself as to why you didn't even try to do something to stop her ever having the chance.
I personally don't think you need any more shit to deal with cos you have been through ennough. Which is why I think for your own sake you need to go to thenpolice and give them all the help you can, company car logs, details, heresay the lot. They will do as much as they are able and willing to do. The results may not be immediate, but in the medium term they may be the vital element that gets her off the road before something truely awful happens.