Golshifteh Farahani is an Iranian-French actress. She has a very regal face, which fits with how I imagine Lada.
Khulan Chuluun is a Mongolian actress.
So far, my theme for the wolf pack has been actors of color with an emphasis on Southwest and Central Asian actors.
Lada is described as a pure black wolf. In the real world, this would mean she probably has melanistic coloring. Not sure if the same is true of werewolves!