I concur with Brack. She's probably tired of it and ready for a change. According to her page, she's just turned 20, so maybe she's looking for a more "mature" look. Almost all women with very long hair eventually choose to cut it. Sure it's sad, but to me the cutting is actually the ultimate final celebration of her long hair.
I just hope she can be convinced to share photos or video with the community. I doubt Ltress could do it, but seeing that lovely classic-length silk snipped above her shoulders could be one of the best makeovers ever, and there's probably a lot of us who both loved her long hair modeling and would love to see that.
And if she cuts 12", it's a shame, because that will leave her with ordinary mid-back hair. Personally I hope she either keeps her amazing hair, or cuts it above her shoulders. If she's really looking for a coming-of-age change, 12" isn't going to do it. And bobbing her hair or cutting it short would be a great way to end her long-hair modeling career with a bang instead of a whimper.