The girl I met had prolonged eye contact and smiled while talking. Is this a sign?

I met a beautyful girl today and we started to talk. We talked almost in 2 hours and she seem enjoy it. During our talk she made eye contact and smiled at me. Is it a sign that she likes me? She also said that she liked the talk

The girl I met had prolonged eye contact and smiled while talking. Is this a sign?
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