Expression: Possessive about one's language

[Tom]

Hi

Could we say that:

1- She is very possessive about/ with her use of the English language.

The intended meaning is that she does not like being corrected or interfered as far as English is concerned.

Tom

[Yankee]

.
Are you referring to a native speaker or a non-native speaker, Tom?

Instead of the word "possessive", you could possibly use "touchy" or "sensitive", for example.
"She is very touchy about people questioning her English."

"Defensive" might also work:
"She's defensive about her use of English."

If she tends to make mistakes fairly regularly but refuses to accept the fact that she's made a mistake (or mistakes) when told:
"She's quite pigheaded about her use of English."

Using the word possessive makes me think of the way some British English teachers react to Americans who teach English...

Amy