Try to just draw in most of ur classes, listen to music or anything else u do in class when bored. And in band just try focusing on any other friends like Emma or something (idk)
Idk what to say or have ya do rn but maybe Yuna is just having a bad day or overthinking things. Also just try passing notes to her if ya don't wanna talk to her face to face to see what she says since it's kinda like texting (idk again)