So you really didn't lose anything did you?
She lost the element of surprise. And right or wrong, often the first version heard of a song becomes “the right way to play it”.
There are a number of hits that are covers of other peoples’ songs. Tommy James sought out such a “hit ready” song (Mony Mony) after seeing the Riveras make a hit out of someone else’s song (California Sun) that was already a live hit for a number of regional bands.
Elvis reportedly would base his covers of songs off the first version of a song he heard (thus the whole bit about the rabbit that isn’t in the original version of Hound Dog as recorded by Big Mama Thornton).
https://www.youtube.com/watch?v=fJQ-fDb4M4s
The public is fickle like that.