The one who Hisa had dubbed the "Star of the camp" is Yumeno Maho.
Saki is awed as Maho shows off her ability to copy the play style of all of the players of the Kiyosumi mahjong club.
Calm down, Momo. It's not like 
something special's going on.
اهدئي يا مومو، الأمر ليس مميّزاً كما تتصوّرين
Beruhig dich, Momo. 
Hier geht nichts Besonderes vor sich.
Cálmate, Momo. No es que pase nada especial.
Cálmate, Momo. No es que pase nada especial.
Calmati, Momo. 
Guarda che non è successo niente di che.
Se acalme, Momo. Não há
nada de especial acontecendo.