Kid/tween furniture is a rip off. Just get a decent adult bed. I think bed frames are a waste. We just do headboards (make them ourselves with wood and padding and upholster with fabric). Super comfortable and can make it with whatever fabric you want and change as often as you like.
If you do want a bed though - just get an adult bed that can be used for years. Is she going to want to come home from college to something from PB teen?