She was ranked the most politically left compared with the rest of the senate freshmen in 2018. Bernie was the second most politically left of all the senators in the same session.
I know there's another site that shows how they voted on everything but I haven't found it yet.
It's also worth noting that she served less than one term, so her sample size is incredibly small compared to most Senators, but I honestly couldn't give a shit. She's not a facist and she's not sundowning, so whatever, fucking run her. Whatever gives the Democrats a shot at limping over the finish line is fine.