She doesn't wear glasses... did anyone see glasses in her room?
She just made mashed potatoes, not soup. She isn't wearing glasses. She does not have a cleft chin. She appears shorter. Her cheek bones are different. She's wearing a robe instead of the same fleece green dowdy pajamas. It's a fairly close look-alike. I might agree with her being a sister if she speaks Russian or Ukrainian.
If it were the original Nora, then something really bad happened back home. REALLY BAD. Van, NL, and I would prefer to not consider such a circumstance.
The only thing I find familiar is her voice, she sounds a lot like Nastya