Is it a good sign if they initiate contact?

I like a girl at work (don't get started on that). We've had many good interactions but the past 6 months or so. It has gone by abit slowly since we rarely see eachother or get a chance to chat. But even though we are both shy, especially her, she has started to initiate conversation. Things like, waving and say hi, and how are you. Before i get a chance to say it, which i feel is good progress.

Is this a good sign she likes me too?

Is it a good sign if they initiate contact?
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