that said..use the book of face for the only good thing it has.. the possibility to drop a oneliner regarding something she has said that can be taken in more than the way she just said it. in other words, make a joke about what she has posted on her status... if it's acceptably racy, even better.
not necessarily in public. can be a private mail too...depending on the joke and the level of exposure of your dirtyoldcreepiness it sends to your other contacts.
if and when she reacts to your joke with a positive feedback (a simple "lol" will do, I'm told).. take the chance to throw in a "long time no chatted" kind of thing.. get her in private chat somewhere well away from facebook and forget about facebook for the reminder of the situation. facebook does more damage than good... so.. get her in private conversation and be equal parts of interesting, interested in her stuff and amazing/funny to talk to.
if you can do all of the above, you're set.
if not, you'll fail miserably..
so... no pressure.