This might seem a little dorky,. but it may help expand her limits -- Spencers and other such stores sell Romance Dice (
http://www.ladybliss.com/Catalog/Products.aspx?pid=9631) where you roll the dice and the person does something silly - (or romantic)
She may be afraid of going to far and not being able to stop -- so if all she has to do is what's on the dice, it may be a safer way for her to expand on what she'll do.