Helping my sister

Hello

I've been trying to help my sister who's been suffering from mental health issues(anxiety and depression). She seems to feel really safe being close to me and likes to spend time together. Our parents think it's nice that we've grown closer again, since we used to be really close growing up. I know some might find it odd how close we are, but it seems to help her.

What should I do? Any thoughts or advice? I'm open to chat more