M20 and F23 siblings closer than we should?

r/

My sister seems pretty attached to me. Often wants to spend time together, be close and cuddle too. She’s been suffering from anxiety and depression so she’s quite a fragile being and I try my best to help her. She’s getting professional help too

I’m not completely sure but I feel like her issues might have come about from when she was harassed when she was younger.

As we have a closer than usual relationship, should it be continued like this? Grow more distance? Become closer? What would be the best way to help her?

TL;DR I’m have a close relationship with my sister, is our relationship oddly close? How should I help her with her mental health issues?