I Feel Guilty

I feel guilty. I just bought a new car!! It's fully loaded and got an amazing deal!! I feel guilty though bc I have a sister who has made some terrible life choices. Out of the 4 siblings I give her money when she needs it and send her clothes and whathaveyou. She has been living in her car off and on for a few years. I live alone in another state and have a spare room. But I honestly do not want her to come and stay w me. I just feel she would never leave and I'd be taking care of her forever...I have told like 5 people I have a new car... I want to share w my family but the guilt is killing me. But I've worked my ass off to get where I am... but I'm tired of helping her when I know she can do more to help herself. I actually gave here my old car... side story; I had a 2000 gave it to her and bought a 2014 but just something just in case I had to help her/family... and didn't get what I wanted... so 3 years on now I bought a 2017 while the 2014 had value and got what I wanted.
She's never paid me back but says she will but she doesn't have a job...my guilt says I should help her but I'm over it... saddened...