@lake356 I was upset about it too, but I think it subtly highlights that physically fighting isn't her "power" per se; it is but she's got magic and stuff too that's more powerful.
@robert4963 So you'd rather Meryl bulked up for a small role with little to no speaking lines rather than someone who is already strong and athletic? That seems more cameo to me.
@pastorjdh And one of the fighters young Diana sees is Ann Wolfe; who totally kicks some butt in training and then you get the reaction shot of little Diana in awe and then mirroring her moves.