Some of the Olsen blades offerings (like the Precision Ground) have a little more heft to them and I would think could handle more abuse.
That said #5 isn't a small blade, so it should be able to handle a lot.
Here are my ideas:
1. What type of Saw is she using. If it is a DW788 or EX, then she needs to check the set screw to make sure it hasn't worked itself into the clamp. Newer (non-Barrel clamp) Hawks might have this same deal, I'm not sure. If she is using a Hegner, the top clamp should have some slack to swivel slightly.
2. Does it always break on the top (or the bottom). The thing is, if the blades were weak, I wouldn't expect it to always break towards on the same end or in the same place. If it always breaks near the same clamp, then focus on issues with that specific clamp.
3. You said she was an experienced scroller, has she changed saws since the issues started, or is she using the same saw she has always used?
4. How thick of wood is she cutting? Thick wood is blade abusive.
5. Have her cut for a few minutes, then check blade tension to see if she is losing tension after it is initially set. Blade could be slipping.
6. If you yourself cut with FD #5, then as a sanity check, have her give you a few blades to test with, which takes her saw out of the equation.