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@queen_e_o The reason she is the tesseract, and I should have explained this more, is because she is from Asgard and is older than Odin. When she was in a battle and she wanted to preserve a part of her self, kinda like Voldemort did with the horecruxes, so she made the tesseract. So the tesseract is a horecrux. Just she didn't have to kill anyone to make it.
I was so happy I got your message! I love comments that points out that doesn't make sense. I almost did a happy dance. I am just waiting to get my first hate comment. But anyways thanks for the message. I hope I cleared some things up for you. Have a wonderful day! ^.^