Xerath isn't a bad choice against her, but you will almost always have to be in the fog of war to her. She can't farm very well, so you stand a decent chance against her by pushing her back to her tower. Besides for Xerath, it's just about early MR and sustain. LB kind of relies on getting kills to get her gold early on, so playing like you're deathly afraid of her helps a LOT. I'd go so far as to say getting a Negatron Cloak. Realize that if she doesn't get kills, she'll either farm poorly, or farm decently but b a lot (if she uses her spells on minions). Her innate troubles with that means she can't outright buy the expensive items AP champs want. So if you can farm up to a Cloak early on, you'll be stopping a lot of damage from her.
While the ability doesn't exist for all champs (and I don't recommend all the champs I name to go up against her), breaking her combos with your own spells helps too. Sivir and Nocturne both possess spell shields, Morgana has a shield to stave off silence, and Fizz and Vlad both have untargetable states. Come to think of it, a good Fizz might do well against LB. Yes, she has the range advantage, but she loses a lot of her burst potential if she can't land her Sigils (it's really the key to surviving; stop the Sigils), and he has his own gap closers to counter hers. He does lack the sustain a champ like Morgana and Gragas have, but he's perfectly capable of bursting her back.