Girl that I like one day or of the blue starts acting close but goes back to normal immediately after. What does this mean?

We used to hug in front of her house but one day she brought me to the park and walked for a while before hugging me (it was a different type of guy, she wrapped her arms around my neck despite her being shorter than me). This was all it of the blue and I was left confused by her possible meanings. She then told me how she is working on her feelings towards me. What does this mean?
Girl that I like one day or of the blue starts acting close but goes back to normal immediately after. What does this mean?
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