Why would an introverted girl give mixed signals, but start dressing in baggie clothes when I pulled away and ignored her?

A really introverted girl would always wear really tight clothes, and I would often notice her doing things to get me to look at body (like arching her back while giving me eye contact). One day she was smiling at me then turned her back to me and bent over and tied her shoes without bending her legs, and peaking over her shoulder at me.

Later that day, she went back to ignoring me and avoiding eye contact, and I got frustrated with her mixed signals, so I pulled away a bit and ignored her. After that day, she started wearing baggie clothes, and pulled her sweater down over her butt any time she walked in front of me. From that day on, she continued to wear baggie clothes. Any idea why she would change how she dresses, and start dressing baggie clothes when I pulled away a bit?
Why would an introverted girl give mixed signals, but start dressing in baggie clothes when I pulled away and ignored her?
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