Sorry to hear about your trouble there, mate. I've had that problem twice in the past myself. I think the best thing to do would just be to talk things through with her, and really try and make her listen. Don't tell your friend just yet because that will no doubt split them up. Try and work it out alone with her first, tell her everything you've told us, and there's a good chance she'll respect that. If she keeps on doing it, well then as a last resort you'll have to tell your friend....
Great sig btw Ladyzekke, very firey!
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Formidable Flirty Fishy Sorcerer of the HADB