If Hawaii is anything like I believe it to be her voting against impeachment will probably cost her her job.If by chance I’m correct and if she casts her vote believing that it;s true that would be a display of courage on her part.
My guess is Tulsi has already made arrangements to slip into the national political scene permanently so doesn't need the loyalty of the whacko Hawaiians any longer ... but I pull that part from my butt, don't know if true.
From the article: “The 2020 presidential candidate is giving up her seat to concentrate on her White House race ...”