Rosa is the first mate of Ambrose and thus is the lead female of the pack.
Originally from a large pack, she ventured into the wilderness to find a suitable male and create her own pack. It took her a while to find a good match due to her pickiness, but she eventually settled with Ambrose and had pups of her own.
She has an independent streak within her and if she wants something she will often get it herself. She likes relaxing away from other wolves and will bring down order if she feels the pack is getting too rambunctious (or if they are disturbing her beauty sleep). She sincerely loves her children, even if she snaps at them occasionally, and she has grown to appreciate Ambrose as a mate even if she initially had her doubts.
She isn't a pure wolf, having 25% Border Collie DNA from one of her grandparents, a stray dog who joined a wolf pack. But other than her colouration, she looks and acts no differently from a pure wolf.