instrument jpg
(31.63 KB, 387x671)
>>/1537/
I made a quick sketch of what I remember of the instrument(sorry for the quality), its been around 3 years since then so I'm not sure of the details anymore, the pink thing is a hand, the woman would pull the string that she was holding in that hand, I think the string was only attached on the top but wasn't on the lower end, I don't really remember much about the part where the strings go around those "pins"(black circles that I drew) but I think that there were some of these. Your second image makes me think of it yeah, but since the end of the string didn't seem to be attached to anything, I can't see it as a one string guitar.
I had the feeling that the guide stopping me from telling her about guitars was because it wasn't a technology that her people was supposed to get yet but maybe something that they should find on their own.