A: First off. Why would you suggest for her to call him. That was CHILDISH on your end! If you feel a need to make an ex jealous then your not over her. Stop playing the phone game and just concentrate on your girlfriend, if she is the one that you really want.
A: If she knows you like her then she's flirting with you so you know she likes you too. GO for it ask her out! You both like each other and no one is making a move. So be man and just do it!