The user search is not working right now. Do you know her user name? If so, go to: http://365project.org/nnnnnnn/365 except put her user name where I have the Ns. That will take you to her latest picture.
Honestly, the easiest way is to ask her to send you a link to her page in an email. Then you can bookmark it or follow her. That's what I've done with family members.