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Does sound rather young! I'm no expert, but think it depends on breeds! Has she laid her 1st egg? She may be looking for somewhere to lay. One of mine was very confused the 1st time she layed! it took a few days for her to get over it.
i hope she comes back! they usually do. it sounds like she's gone broody and may have found a hiding place that's secret! I would have a good look around, maybe with some treats to encourage her. I had one hen disappear into the fields opposite out house when she went broody, so maybe the same...