I didn't intend to write much more about cold approaching and better alternatives. However, Cani, a member of my forum, wrote a great post in which he succinctly defines warm and cold approaches, environments, and looks. It's a great read for anyone who comes from a background in the mainstream seduction community, or who simply lacks social experience, and it will point you in the right direction.
Here's a teaser:
Warm environment = a situation where it is more normal to be social, meet strangers (well not really strangers), have common interests, ie niche place, exclusive niche club scene, university students, work or school, hobby groups, gym, house parties, events where people were invited. You could say there is a spectrum from least to most warm environment, that is going in to much depth and is too subjective, i do believe it is obvious which is most warm or least warm. An overall definition could be, some place where there is some common interest that binds the two of you, ie shopping in the same shop (least warm), working together (most warm) etc.
What to do - Just find out about her, normal conversation, depending on type of environment calibrate escalation. Now you can always be fake and lie about the common interest, but that is too much effort and a drain on you self esteem doing that to be worth it.