I agree...anytime of convenience when you are away or she has down time says it all...look for lunch time calls and those where she's on her way home from work...
Something else that's fun is go back to when OM was not in the picture...if you can access her account online and look when she used to call you...you'll probably see that now she calls him...
One word of advice- be careful w/ the intel...it can become kindof addictive and even too much fun to come up w/ theories...keep yourself in check