I don't really blame Ayu for not speaking perfect English. It's really hard to learn a foreign language and become profecient in it.
How long has she been learning English? I think she started studying it properly after her Asian tour. I've been studying English for more than 10 years and I still sound awkward a lot of the time, even though I've been studying in an English speaking environment for around 5 years
And she's probably even less immersed in English than I am.