upgraded to yosemite now pages doesn't work
Hi,
I recently had to wipe my mom's iMac and reinstall the operating system due to a phishing scam. I upgraded to Yosemite. At the time, I went to the App store and re-downloaded Pages that I had previously purchased for her. Installed fine and tested OK. Now a week later, my mom says that the Pages icon is gone and replaced with a question mark. When she clicks it, she tells me that it says WordPress and asks for an email and password.
I had her check the Applications folder - Pages is no longer there. I had her open some old documents previously created with Pages - they open with Preview instead. I can't figure out what went wrong.
Unfortunately I do not have direct access to her iMac and will have to walk her through how to get it back over the phone. Do I just need to have her re-download the update from the App store again, or is there something else going on?
Thanks in advance for any help.
iMac, OS X Yosemite (10.10.3)