Coworker thinks I like her, but I don't!

She's very open, outspoken, I get along with her and we're friends, but for some reason it seems she has taken a step back and it's easy to tell that she's trying not to lead me on, but still being friendly and civil because we work together and she doesn't want to point it out. I don't have a crush on her and because of all this I feel for a lack of a better word, undervalued and hated at times. She doesn't do anything that I can use as an excuse to tell her I'm not crushing on her or ask her if she thinks I do.. What can I do to have a good, healthy friendship with her? say it jokingly? subtle gestures? anything?
Coworker thinks I like her, but I don't!
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