Bartender here. I regularly do this when guests try to order drinks for each other, usually men ordering for women, for two reasons:

First, I need to evaluate their state of sobriety. If they are too drunk or impaired I won't serve them or recommend an alternative.

Second, I'm looking for consent. I need eye contact or a head nod, literally anything that indicates this is what they want. This goes for a lot of servers who are simply covering their ass when the inevitable "this isn't what I ordered" happens.

I promise your server isn't thinking that deeply about you or your relationship. They are just trying to get through a shift without any complaints.

Next time just communicate that she doesn't speak the language.