Does my coworker friend like me or is she just upset about Jen?

I work at my job with a girl named Mary and Jen. They are both friends. I like Jen but i don't talk to jen at all. I'm friends with Mary her other friend. I told Mary to hook me up with her friend Jen and Mary said she was taken and did not want to ruin her relationship so she said no. I said that was fine and we continued to talk here and there as co-workers and i noticed when i don't talk to Mary because of how busy i am at work she gets mad (ignores me) and one time she confronted me saying "so because i didn't hook you up with Jen does that mean you get to ignore me"?

I'm beginning to think the only reason Mary didn't want to hook me up with her friend Jen and gets upset when i don't talk to her is because she likes me is this correct?

Does my coworker friend like me or is she just upset about Jen?
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