were those dreams flashbacks or foreshadowing?

I think flashbacks of the original owner of the Girls body

I don't think there is an "original owner", she has always been herself, she just remembered her past life.
And I think it was a dream picturing what could happen if she went back there. The man says "to think that you would survive the dark forest and come to me", so it is after she was in the forest, not before.