If she was made available to all players, through being recruitable even if you side with the grove, which would make more story sense and make her story beat of liberation and vengeance more impactful if she was saved not by a former ally buy by the one who defeated her, there'd be that 'justification' for further investment to flesh her out with companion quests and etc, if we as the supportive of Minthara forum community push for that, not focus on her current romantic deficits it'd be a better way to make a case to the devs for improvement, and benefit all players not just romance players.
Minthara is the best character and she NEEDS to be recruitable if you side with the grove! Also- I support the important thread in the suggestions: Let everyone in the Party Speak