Would using an edge checker count as checking for vertical edges? If not, I'm unsure how to best do this.
The shorter edge is effectively a little less sharp, and is also harder to reach. So it acts a bit like a non-vertical edge.
BTW, a burr, off to the side, also creates a sliding surface which lets the skater skid sideways.
Probably best to use a small square. I check for burrs off to the side, and to some extent, non-vertical edges, by gently sliding my finger
across (not
along - or you might cut yourself) the sides, edges, and hollow. I also sight along the blade and its edges. Everything should line up - a wavy edge is harder for the skater to follow. Nothing should protrude to the sides. You can also see whether your hollow (and ideally, sides) is mirror smooth (some people use oil or polishing fluid), and has no non-uniform defects.
Actually, some skate techs actually bend the edges slightly inwards. Perhaps they do so because that angle means the flat stone does not touch most of the sides of the blade, so it doesn't scratch them. Scratches creates extra friction, slowing down the desirable glide along the length of the blade. If you do that, I suggest you don't bend it inward more than a few degrees at most. (In theory, I think it would better to bend the edges slightly outwards, because you skate leaned over onto the edges, but that would be slightly harder to do in a uniform manner.)
Let me reword what I said about your daughter forgiving you for your sins. Many pro shops isolate the skate techs from their customers, and give the skate techs little feedback on the job they are doing, or motivation to improve. I think almost any craft person who wants to improve benefits from receiving feedback. Your DD is eagerly providing you the benefit of such feedback. This is a good thing!
BTW, I'm not an expert. I've just been sharpening my own blades (with hand tools, like Pro-Filer and the old Berghman skate sharpeners) for some time, and have tried to learn from my mistakes. I have not benefited from the helpful feedback of your DD, so you will soon be much better. All the best skaters at your rink will want you to sharpen their skates, and your daughter will take great pride in shaping you to be better.
"This is the way."