That "coldness" you detect is her defense mechanism. She's trying not to get too close or is processing things slowly. You're confusing that with lack of emotion that comes with total detachment. She starts acting as if you were a casual acquaintance. She's friendly but you'll get that wall up.
In the beginning it's the LBS tries to batter down the WAS wall (pleading, anger, etc.) which only makes the wall stronger. I've found that it's easier to find little chinks in the wall and slowly make your way in. Eventually the wall gets weak enough that you'll see softening. It took a long time in my sitch, but it's loads better than what it was before.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.