TMZ.com said Mendes has been at the famous Cirque Lodge in Sundance, Utah, for several weeks.
"Eva has been working hard for the past year and made a positive decision to take some much-needed time off to proactively attend to some personal issues that, while not critical, she felt deserved some outside professional support. Out of respect for Eva's privacy, we do not wish to discuss further details," Mendes' representative told TMZ.com.
Mendes' screen credits include "Hitch," "Stuck on You," "Ghost Rider" and "We Own the Night."
2014: The Year in Music [PHOTOS]