Thought as she much, she couldn't figure out why her master would do so. The race of Orcs were weak, their strength and potential were limited. Their race was divided, their king corrupt and they were being targeted by other powerful races of the forest.
In short, they had no value in her eyes. She wasn't the smartest among her sisters, nor she was the strongest. She excelled at a few things and to top of it all, she was bad at housework.
Nevertheless, as a warrior dubbed as a Valkyrie, she had enough discerning ability to tell the worth of the warrior when she saw one.
It was because of this reason that she knew the race of orcs was not worth her master's protection. When he faces future enemies who are much more stronger than the ones they have faced until now, the orcs wouldn't be able to aid him.
They were weak.