I'd change her name to Animal Woman. Vixen is problematic. It's not utterly terrible, but it lacks the authority of the peers I'd suggest for her. And anyway, she can be the Kate Kane to Buddy Baker's Bruce... with Beast Boy as their Nightwing, Monster Girl as her Red-Hood-meets-Batgirl.
A question I struggle with is "who are Mari's peers?" It's not as though she is considered a Big 7 alternate the way Cyborg, Martian Manhunter, Aquaman, and Plastic Man are... She was accepted into the League along with Steel, Vibe and G*psy, and survived that only to be put into the Suicide Squad's roster of expendables. Brought back time and again for stints and guest star roles, and given a significant push through JLUnlimited's series, she's made to bounce back and forth between established chemistries. The effect is that she's ultimately a team player who consistently walks alone. Which is why I wanted to introduce her to the Superbuddies/FKATJL stalwarts, and give her the leadership role that wouldn't fit anyone already there. With Mari in charge, I'm envisioning a cross between Claremont's early 80s X-Men and the Legends of Tomorrow series.
And I'd like to say nahhhhh to whoever suggests Mari should lose her totem necklace. Kids need consistency in their superheroes, and for Superman it's a cape, for Green Lantern it's a ring, Wonder Woman has her tiara, and Mari should have her necklace. Maybe her powers aren't lost when she doesn't have it... but maybe wearing the totem enhances her abilties?