^I was at that concert! *im the girl with the domokun on the dvd!*
I spoke with her, and I was really impressed by her pronunciation and comprehension. She understood everything I said to her, and managed to keep up with my quick, excited pace.
When speaking to the crowd she mentioned that she had only done one other show outside Japan, so she really didn't know what to talk about between songs. *then we all cheered for her
*
If you listen to some of her older songs, her pronunciation isn't always the best - but she's worked hard, and is now an excellent English speaker. ^_^