Problem opening session

Hi there.

A member of my domain as a problem accessing her email.
The webmail session do not open and rest loading without any error message.
All others apps open fine.
Yesterday was fine and her informs that noting has been done to de configurations.

I've changed the password and it continues giving de same problem.

I have already tried with other 2 user and they have open well de webmail.
I have tried other computers et browsers et same problem.
Tried to configure the account on a Phone and it accepted all the configurations but do not retrieve the emails.

Account in question: sana.nezar@performancedz.com
Admin account: simao.duarte@performancedz.com

Thanks in advance.