She and Ferro, two wolves of a now-fallen pack, decided to stick together and form a new pack (everyone else in their old pack either died or split apart. I'll leave what happened to them up to interpretation for now).
Since Ferro was her closest friend, he helped her rule as the only wolf she trusted enough for the position.
She was surprised Hollow Trees grew as fast as it did, but more than anything, she was embarrassed - in a good way! Meum was fine with leading a couple wolves and she became friends with most of them after a while. But her pack becoming a kingdom? Herself it's queen? But it's what the pack called it after a while, and she digressed. All she really wanted was for Hollow Trees to prosper and survive when she eventually passed on.
Sunlit Cave
Spicebush Swallowtail
Moon Flower Bodywrap