I expected her to stay after talking to Chef Ramsey.  Did she expect him to beg her to stay & say how talented she was?  It's one less for him to weed out!  In the end SHE chose to quit.  I don't respect quitters.  I used to change huge hot oil vats every week.  I got burned many many times, going to the hospital too.  The difference is- I showed up for work the next day!  It's called grinning & bearing it!
Every season has someone who quits.  This one just happens to be Vanessa.