She also represented the most liberal constituency in the country, in Hawaii. I think she realized she could no longer honestly represent such a liberal base, although, she clearly still has a lot of love for Hawaii, judging by her videos from there since the Lahaina fire.
To do otherwise would be a complete waste of time, and I believe Tulsi was smart enough to understand that.
That said, I think she has a long way to go to establish any kind of conservative chops.