Yuki has become a bit more optimistic, thanks to Hikari and Machi. She's learned to trust Tetsuo a bit more since what happened last time, and has decided to tell her what troubles her about her own nature as a snow woman. It began shortly after she moved to a new city to start high school, when she was taking a bath one day and a shard of ice suddenly appeared in the hot water. It made her worry about what would happen if the cold air she generated were ever to be directed at a person, which led to her decision to avoid contact with others.
"The crystallization of bodily fluids 
released under stress," perhaps?
ربّما "تبلوُر السّوائل الجسديّة المُفرزة بسبب التّوتّر"؟
Wie klingt: Stressbedingte
Kristallisation von Körperflüssigkeiten?
¿Cristalización de fluidos
corporales por estrés?
¿Cristalización de fluidos
corporales por estrés?
« Cristallisation des fluides sécrétés
en situation de stress » ?
Vediamo... La cristallizzazione
di fluidi corporei rilasciati sotto stress?
Que ocorre a cristalização 
de fluídos corporais sob pressão?
Кристаллизация жидкостей,
выделяемых при стрессе. Так, наверное?