Ipad 2 Suddenly Will Not Send AOL Email

My mother has an Ipad 2 and uses both gmail and aol email accounts. She has had this set up for several months with no issues. Suddenly, a few days ago, the AOL account will no longer send emails. Instead, the email is placed into the Outbox. The gmail account on the Ipad works fine. I logged into her Aol account on the computer and sent emails without problems. I added her AOL account to my Iphone and was able to send emails. On the Ipad, I shut it down, I rebooted it (little white apple logo etc), I deleted the AOL account and reentered it at least 3 or 4 times. The password is correct.