Definition of girl crush?totally confused i have a friend we both are married i am much older than her and ?

Have been married longer than her. She and I get along very well together. Never had a disagreement ever. We flirt with each other a lot. I often hear my name come up in her conversations with others. We don't touch but if we accidently did. She would jump. She does a lot for me not wanting me to so anything in return as a sign of thanks. I'm not sure her angle. Could she like me but is afraid?we are from two different backgrounds. I figure I just have a great friend. She always hold doors open for me and wants to get me drunk. I think she watches my rear. Plus getting me drunk she can have her way at me. Why not b honest and tell me you want me instead of try get me drunk. Is that not the easiest way for people to take advantage of others?is this a girl crush?experiment?