But what purpose does she serve as a companion? Why is she a companion?
What is the purpose of any of the companions? To entertain us players with their stories and add to the fun of playing BG3. I think Minthara could have some more work done to her story (give her more intereactions with Orin), and a second romance scene like every other companion. But she is worth recruiting, her story is very interesting and her VA is great.
