That crazy man…
She swore thinking of Grey. He did acted very nicely with her for those two years but his act of doing everything so, that she stays inside the house the maximum time made her suspicious.
She did forget all her memories ironically. The girl who used to remember and burdened by her memories of two life was finally free from everything after forgetting all those things but two years didn't let her stay unknown from her own origin.
She has all the skills and talents with her and so, after going through the internet a few times, she figured out her real identity.
She was already very suspicious of Grey because of his sneaky behaviour so, she did her own background check. The reason was his continues nag on keeping her hair dyed in golden and putting lenses. Now she knew her real name wasn't Ora but Cynthia.