First off - make sure you figure out what you actually want. Don't just go for CF as you think it happens to sound glamorous right now..
In your shoes, if I decided I wanted CF, I'd probably concentrate on landing the audit offer with EY as a back-up given you're a good way in to that process already. I'd then use that internship as experience in applying for CF roles at other firms. That way you have 3 attempts at CF, and if you don't make it then hopefully you've got an audit offer providing you impressed on the internship.
The Audit > CF route is reasonably well trodden, but it is tough to do due as there is a lot of competition.