Hi and welcome!

Even if she doesn't have proof of when she entered... has she gone to school here? Has she been to the hospital? You can use transcripts and medical records as proof of how long she has been here. I'm guessing she was brought here when she was a baby because you don't even know if she was born here.

Since the DREAM Act requires you to have lived here 5 or more years... if she even has records of the last 5 years, she will be ok.

Thanks again for joining and stick around!