How can I help my little sister?

My younger sister is 12, turning 13 in a couple months, and she struggles with SH. I won't get too in detail of course, but I just want to know how I can help her. She's on medication and she's been to therapy, but she still struggles and I really don't know what to do. I've tried to offer comfort where I can and for a while she was doing better, but earlier this week she relapsed.