[she's heard the voice, but not put it to a name - that's alright in her book. a new person just means to be extra courteous and polite for now, and perhaps this one will be willing to take her trade.]

Good day, I was looking to see if one of the sewing club members could take on a small repair job for me. One of my school shirts...I felt a tear in it. I have merit points to trade, for the time and work!

[simple, straightforward, and honest - she can't sew a single stitch, so better to leave this in the hands of more skilled sorts.]