Just say hi, ask her what shes doing, and takeoff from there.
i.e. "What are you doing?"
"Watching the game"
"What game?"
"Vikings vs Titans"
"U like football"
"Yea"
"Oh, wuts ur fav team"
"Vikings"
"Oh really? Cuz theyve been my fav team since 05(lie but she'll beleive)"
I dont hav to go further, and the subject should change every 15 minutes or so.