Searched on her phone number and found nothing.
A tineye.com search on her pics revealed nothing.
A search on her email address did find a few things.
a tumbler site - http://sofieviza.tumblr.com/page/2  Which leads me to believe she is legit.
this youtube video - http://youtu.be/aNLQu3o2m3s

I would email her, tell her you saw her ad and ask if she is really in LA and what her rates are.
Never hurts to go straight to the source.