First of all, is she right-eyed? If you're not sure, have her point at something, then cover each eye. The eye that keeps her finger on the object is the dominant eye, and you'll want to sight with that one.
I think she should learn to sight with both eyes open, as it lets in the most light to the sighting eye. If this is difficult for her, you can cover her non-dominant eye, but she should keep it open.
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