Or quite possibly just regular fails, if the negotiation with the spiders had gone badly, for example.
But in this case, an earlier point of mine still applies, if Mathilde has a vastly better tool, her options open up. For example, if she has a S10 weapon, she becomes an amazing saboteur, and that might appear as something she routinely does on regular scouting missions. The same with assassinations. If, for example, we had a more focused scouting turn with the Night Prowler face of the coin active as well as a superweapon, Mathilde might well impose an absolute reign of terror over the local gribblies, destroying all their infrastructure and decapitating their leadership. As she isn't currently confident of her abilities, she wouldn't, but that combination of items together is an absolute game changer.