I think the author meant that she was just trying to work on her slides, and was hoping that by quitting/restarting, the bug would temporarily go away, so she could continue working on what she actually wanted to work on, and not go down a debugging rabbit hole.

Certainly the determinism made it easier to fix, but the determinism also meant that she had to stop what she was doing and fix it right now, which is... "sadly".

Sadly as in "Oh dear, I better start debugging this" I think.