Dear Katayoon,Maybe you sent her birth certificate? Or some other document? The passage from letter that you pasted does not say anything that would suggest that it is about your daughter's proof of English knowledge, so it is hard to understand. Maybe if you paste full text from your letter, we can help better.
I think the part that confuses you is "foreign". When they write foreign, it is foreign for them (arabic, farsi etc.), not foreign for you (english etc.). I do not see any connection to your daughter or her education from what you shared. I am under impression it is some document you translated but did not submit copy in the original language.
I think one missing as you said is about birth certificate, so I translated her birth certificate and sent its copy, but I didn't provide them a copy of back home original Birth Certificate, but is it necessary because I've never seen any where which I have to provide the copy of that specific case !
Isn't it ?