I think over the past few years her pronounciation & probably grammar has improved although I still have problems understanding her as her Japanese accent will tend to get in the way unlike KAT-TUN's Akanishi Jin where his Japanese accent's not there
I don't think you will be hearing Ayumi ranting stuff like Car Shrimp
(classic one Akanishi
, before he went to study Eng for 6 months in LA ie. heh
)