Observation

My parents met a Nursing student from China at church, and decided to invite her over for dinner. My mum - in all honesty - is not normally the type with the quick, sharp remarks. But while that may not be so impressive, what does impress me - as a perennial monolinguist - is her ability to speak perfectly pronounced English... as a fourth language.
Now during dinner, my mum was quizzing this Nursing student on the college she was studying at.
"So, are they teaching you nursing? Or Engrish?"

Did my mum really mispronounce that word? Or was my mum making a sly observation?