Sister struggle

I love my sister very much. She’s making a choice that I don’t understand and don’t think makes sense. I’ve thought a lot about it and my ultimate goal is to have the best relationship possible with my sister, which makes me think I should just let her make her own decision and not get involved. But I also know that people pleasing and not being authentic can hurt relationships. So should I tell her my opinion but that I love her no matter what she does?