There are charms but ultimately it's your choice [I know, I know, your ex] I see spells of this nature like affirmations, if you believe in them they work wonders, if you roll your eyes at them they will fail. Try making or buying some jewelry or keychain for her, charge it with positive energy and giving it to her. As her ex this might seem weird, but that's probably your best bet. Everything else is her choice, if she wants to move on or wallow, her choice.
Keep in mind two things how long ago you broke up and how long you were dating. Don't expect her to bounce back from a 10 year relationship after a week, it takes time. If it's been years, it makes sense you want to help her move on.