It sounds like your daughter has memory issues like Dori in Finding Nemo. Once you come to an acceptance of her abilities, you can come up with a plan or rather a guide for her future and for maximizing her potential. Surround her with loving, Christian persons and pray for God to guide you and her as she matures. She can have a very happy, fulfilling life. It may not be what you would find fulfilling, but your wants don’t matter. Love her and nurture her where she is. Let God take care of the hard stuff.
If I may say so, the first part is the hard part, or at least the main part. Having attended to that, it is the DETAILS that may be entrusted to God's wisdom.