Hmm....anyone got any opinions?

My friend Anna is a lez....she just told me that she thinks her co-worker like her. However, her co-worker Natalie has a daughter and a boyfriend. Can my friend Anna mistaken something? It seem like Natalie is straight but Anna told me that Natalie always smile and said hi first. Even, when Anna was sitting in the corner, Natalie came over just to say hi to her first. In addition, once Natalie comment on Anna that she looks so cool with her sungles on. Does anyone have any ideas or comments for my friend? Thanks!!!!