Not sure I would say she was this extreme, nor did she ever claim to be "hopeless romantic", but the general situation about her coming on super strong, then changing gears certainly fits the bill. It was like the emotional high was gone, so let's take a step back. When she took that big step back, I should have taken two steps back. It is funny that I remember thinking before that happened.. "I wonder if this relationship will flame out" because she came on so strong once we got secksual... lo and behold, I should have trusted my gut...
And to add, she is a huge disney, hunger games, harry potter, and all other things fantasy fan... Probably also a point to add to the OP. Be aware of women that are huge fans of fantasy novels, TV, etc.!