Old enough to feel the weight her mother carries since her uncle didn't come home.
Old enough to know what her uncle's death meant. Wini is one of Cerys's two children, age 12 — named alongside her younger brother Hewyl (9) in the example that establishes Cerys as Garet's widowed sister.
GM notes
Garet had sister: Cerys (widow, kids Wini & Hewyl, 12 and 9).