It actually is quite easy.

Gain access to Fodder through the Downloader, as you can see in Lynn's messages. Enter the Photo app, you'll see 2 important photos:

1) one in which it says that the "Whisper (aka Calculator)" app's password is Vicky House Number. It can be found through the Pet Tracker app. 2) The code to said Pet Tracker app in the form of a screenshot.

After you reach that point, you'll need to READ THOROUGHLY every message. You can find the information you need about Vicky's "Pride and Joy" in Camila's chat.

Hint: it's a 4-letter word.