If a shy girl showed interest, but avoided me after I made a move, was she just leading me on?

Anonymous
A shy girl would indirectly flirt a lot, and constantly gave signs of interest. She would often look away really fast if I caught hey looking. If she flirted intentionally, it was awkward and tense, and she'd stumble with her words.
I told her I wanted to get to know her better, and after that, she completely avoided interacting, avoided eye contact, and had a blank, cold expression. Can anyone venture to guess why a shy, introvert girl would act so giddy, awkward and flirty, then completely avoid the guy and act cold after he says he'd like to talk more? Was she just leading me on?
If a shy girl showed interest, but avoided me after I made a move, was she just leading me on?
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