This is what I would do also, though, to be honest, it would be very hard for me. I say this because I am shy and don't like to "rock the boat." BUT, ft it was my sewing machine, I would do it. I would also have to write out what I was going to say before I went. This would give me confidence. (Not that I would read from my script or anything...
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More than likely, you are not as shy as I am, and you can do this easily! You do need to explain that you don't understand what is going on and see what she has to say.
Good luck. My thoughts will be with you.
Dina