You really dodged the bullet on this one. There is no way she is going to be happy. I have an antique bed - even have the metal box springs from 1860's. (The feather mattress is long gone - it had more lumps so sleeping on it was like sleeping outside on rocks.). I can't imagine why she has it so high. Sounds like she will need a King size quilt to cover that much mattress, but feathers settle, so that will alter what she wants. It's just sounds like she is asking the impossible.