Most Helpful Guy
You don't bring it up to her. Girls don't like being called on being distant. Your best bet is to avoid over-contacting her. Let her put in some of the effort if she's interested. Don't call her out on it, but don't initiate calls/texts/dates more than she is. You can't generate attraction in a girl faster than she wants it to go. The more you push, the more she'll push away. That's a mistake most guys make. Don't be THAT guy. If she's into you, she'll come back soon enough. I know you want her badly, but that usually ends up being the death knell of the dating experience, when the guy starts getting needy and she's just not willing to put in the effort and is actively turned off by your behavior. Ignore her for a few days and don't talk to her at all. Go hang out with your buddies and enjoy yourself.