How can I give comfort to people in real life??

I'm at a winter camp, and someone there has bipolar and ADHD. We're not particularly close, but I like her and feel sort of responsible for her.😇 Then today, we're asked about our ideas for our musical performance tomorrow, and she lost it. She looked devastated, with her face in her hand, saying she wasn't good at this and she couldn't do it. The professor had a private talk with her, and when she came back, her eyes are red.🥺

When people ask her, she said she was fine, but I know she isn't.😔

I really want to help, but I just don't know how! I'm also a listener here, but saying those things in real life seems weird and awkward, especially as I am really socially awkward.🤔

I have major depression with a seasonal pattern (No official diagnoses because I don't want my parents to spend money on this. My education is too expensive already.). When I'm just sad, I would talk to people to feel better but when I'm in an episode, I wouldn't. Because there is nothing they can do. It's just so dark, and I'm in a black pit, and I can only accept that and wait for it to go away. (I think I'm in the beginning of an episode. This time it's all my fault though. I'm in Hong Kong to get a change of climate, and at first it worked really well. But I was reading novels and playing games and only got two hours of sleep the other night. With the help of coffee, I'm inattentive, wooden and feeling unworthy.😅) So I understand how she might be feeling, but there seems to be nothing I can do to help.😮‍💨

Any advice?💜🤗