It's the bear thing that I can't get past. We all know that crazy and unpredictable things can happen in the woods, but if she approached a bear cub with her dog in tow I
believe that 1) her and the domestic dog would have gotten it first , as they would have appeared more of a threat than the wolf due to closer proximity (because I doubt that she sandwiched the wolf in between her and the bear cub), and 2) if this were a black bear, I think that the mom would have perceived all three of them as a threat and treed the cub and waited it out. Black bear are awesome tree climbers. No reason for mom to get into it with a wolf, dog and random human if she can just wait it out. If it were a grizz, I go back to #1 and think that it would be ohshit for her and the dog as soon as she approached the cub.
Who knows though, like I said, crazy and unpredictable things. Maybe the wolf voluntarily went after the bear cub and ended up as bear scat. I hear it grows some great mushrooms...