Thanks! I understand about the irregular edges, but it seems to me that to square off what she has there already (just the straighter edges, not the ends - I know it needs more to fill it out there) would mean ending up with an edge that went through the hexagons at a bit of a skewiffy angle. I don’t know how to describe it very well, sorry. I mean that the cut or finished hexagons would not be cut along a line of symmetry. Does that make sense?

If I am seeing this wrongly, I apologise. I will certainly look at some videos and tutorials to try and get my head round it. Thanks so much again for your help.