Didn’t mean to give that impression. It’s always nice when someone has someone else’s best interests at heart, but you can only do so much before you have to allow that person to have control of their own life and stop thinking you know better. Like I said, OP can offer advice, but that’s ALL he can do, and ONLY until she doesn’t want advice anymore. Anything beyond this borders on trying to control her decisions, and that’s degrading. It’s degrading even if you have her best interests at heart. It’s not up to you to be her hero - it’s up to her to save herself. She can’t rely on others to make her decisions for her.
No matter how much you care for someone, you have to allow them a sense of personal responsibility and hold them accountable for their own decisions. Only Christ can save everyone - I can act like him but not as him. I know I’m not exactly the model Catholic, so I’m not at all saying that my opinion on this is completely right, but I would ask a priest, OP - I agree that we have a responsibility to help those in need, but if your sister has made it clear that she is not in need and does not want your help, it would be wrong to force her anyway. Respect her ability to make her own decisions and have her own opinions, even if they are different from your own. I think to love and accept someone as they are, even if you personally disagree with some of their decisions, is a pretty powerful thing.