She is mesmerizing.
Anybody that thinks Ms. Horn cannot act is only used to over-the-top 'acting,' the more common Hollywood rubbish. The subtlety of her facial expressions, the nuances in her speech, that is what makes her acting (and her) so appealing and GENUINE. She is exactly as a normal person is in the movie, not a caricature. Some people may prefer the latter, but they should not mistake such a preference for 'better acting.' This is probably a reflection of people's lack of appreciation of, and attention to, detail.
I wish her well in her career and hope to see her more often.