Yeah this is weird, especially since they seem to be bringing back everyone else not named Will Smith (including Brent Spiner, who DIED in the first one). Mae's still acting, she does live-action acting as well as voice acting, and she's freaking Katara from ATLA. So this recast makes little sense to me, and by the sounds of it, she wasn't even CONSIDERED for the role.
God I hope that it's not a case of some Hollywood guy thinking that she's not "conventionally attractive" enough, because that'd just be sad and pathetic.