There's only one thing you can do at this point...
The freezeout.
Cut off all communication with her. Act indifferent if she calls you. Don't reach out to her. If you do speak to her make it abrupt. She'll go nuts wondering what happened. She'll start thinking about it like crazy. Don't give any reason for your behavior. Let her miss you. Then when she can't take anymore. Lay a kiss on her. Out of nowhere. If that doesn't work, then forget it. You're "buddies" for life.
The freezeout.
Cut off all communication with her. Act indifferent if she calls you. Don't reach out to her. If you do speak to her make it abrupt. She'll go nuts wondering what happened. She'll start thinking about it like crazy. Don't give any reason for your behavior. Let her miss you. Then when she can't take anymore. Lay a kiss on her. Out of nowhere. If that doesn't work, then forget it. You're "buddies" for life.