I would wish her the absolute best, but that this isn't the relationship dynamic you're seeking.

• She's not only still talking to her ex- she's comparing you to him (he just "knows her better")
• He's the only person in her hometown that can give her updates- like really? It's either a small town and she wants updates on the cows, or who does she want updates on that she can't pick up the phone and call directly- or connect with on Facebook? If she really wanted to talk to old friends she'd talk to the old friends.
• You guys started dating pretty quickly after she broke up with this guy- people need a bit of time for this type of back and forth before they get into new relationships and it doesn't sound like that happened.