Did you watch the YouTube Video?
It was kind of subdued, but to be fair I think it’s quite a difficult song. I don’t know if it reflects on Amy’s state of health though, because not every performance can be as good as the Mercurys. With every artist who gets ill there is always this pressure to come back on top, rather than taking time out to heal.
Maybe she didnt wanna say fuck on tv … edit, oh well she said it in Mr Jones anyway… ahh 
I think that was part of it and she missed the previous line as result.
Her performance made me sad too. No she’s not lost her talent, she’s just really sick and not doing anything about it.