A girl not responding to messages is not a good indication that she is BS. You would most likely have filtered out the BS profiles before you get to the comms.
A lot of the genuine EE girls in London seem not to bother with the messages - I'm guessing partly because of language problems, because of the volume of messages they get, and partly because they are getting enough work via phone/txt. Call or txt if they do not reply to a msg, they are more inclined to respond.