SPD > Health% > Defense > Effect Res > Attack
Her gearing is definitely a WIP, but even like this my Tama does so much for the party. SPD set is great for cycling through turns because you want to get through those long cooldowns as quickly as possible. Also got SPD mainstat boots and Health% on both accessories for better heal scaling. ATK isn’t a horrible stat to have on her, given her dispelling AoE attack in idol form, but Health is better because she’ll mostly be healing. Defense is okay too-- other Heroes make better tanks, but sometimes Tama goes in front for easier missions like farming fodders and Awakening runes.