Very odd, it could be a wax particle, or perhaps some piece of debris it picked up outside the hive, it looks very thin and somewhat like a plant fiber. Did it appear bothered by it, or like it was removing this from the hive?
To me it appeared to be a problem for it as it ran around a lot
The hive looks very healthy
The shape having harsh corners might suggest it is not natural unless this is just blur of the camera. Could it be something like a small piece of tape? There is a more defined area that kind of looks spidery to me. A very unusual find that is for sure.
I have a vid of it but it’s too large to upload
It looks a bit like a cone shell you find at the beach only tiny
If you upload it to youtube as a public video, then post the share link here, we can all see it and help you.
Well done! It worked perfectly. It looks like she is carrying it in her mandibles. I speculate that it is a wood chip from inside the hive. She will work out how to carry it out and dump it outside. I don’t think that you need to worry
That’s a great help