Why did she get mad at me for refusing friendship after rejecting me?

The signs pointed to she liked me and I went with my gut and told her my feelings. Well I got rejected and I stopped talking to her and avoided eye contact. She started staring at me, locking eyes, and using my first name so I could ignore her. I eventually told her that I can't talk to her without feeling pain and walked away. She would stare at me every day in college lecture without a smile it was a blank soul peircing stare and I could tell she wasn't happy with my actions.
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From what I gather the guys that answered said she's being I'm nature and the girls think I'm the immature one lol
Why did she get mad at me for refusing friendship after rejecting me?
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