Who gives a shit?
It's our National Anthem so I'd say something like 300 million people give a shit. Further, it's disrespectful to say it wrong and just pure ignorance on her part for not, you know, practicing her lines and memorizing the song in the weeks or months she had to prepare.
Just watched a video of it, sheessh. That performance of it was just all around horrible! Ugh.
You can memorise the words to a song as much as you like, and it's still possible to fuck up. One of the times I saw Metallica live, James Hetfield fucked up the lyrics to Master Of Puppets - a song he's been singing and playing for over 20 years.
It happens. This is not news. Get over it.