I’ve made a note of her Zombie blessing in the Status effects thread.
When I fought her in the challenge event, I didn’t notice a buff or anything like that for her resurrected zombies 
But I did note that zombies themselves can not get the buff again.
Also with @Aquaginera_7DD’s help, we noticed that Muggy’s Bruiser Bro does not stack with Zombie blessing. Since Atomos and Muggy don’t stack, I’m assuming the same is true for the zombie blessing.