I'm so sorry, but the adoption is not enough to give her legal status in the US through you. She would have needed to be adopted before turning 16 for her to be able to get any immigration benefit from the adoption.
The only way for her to legalize at this point is on her own, for example, if she married a US citizen, if she won an asylum case after applying, through an employer's petition in the future
I'm so sorry. Wish I had better news. I hope you can understand that I don't make the laws and I cannot change them.
Good luck to you and I hope this answer has helped you!
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