From her Wikipedia entry:
Shiraishi married on September 6, 2012 [4], but divorced in 2013.[5]

In the 5 link:
"It's far too soon after my marriage announcement, and I am filled with feelings of apology towards all the people who gave me words of congratulations. I am truly thankful that I was called by many programs to appear on them when I was married.

About what's to come in the future… I think I'll go back and forth between various things, and I'd like to enjoy some fun doing work while being true to myself!"