The problem is how she went about it, she conveniently doesn't tell Thirteen and Khalid that using Fate's helmet makes you into a glorified slave, and Khalid, already knowing that, calls her out on it, and when she goes talk to Thirteen again, all she says is "You can say no" instead of explaining it better.
At the very least, Zatanna recognized that Mary has a power addiction issue and didn't let her be part of it, so she's not making a problem worse, it's just how she's lying by omission to the other two that makes her look bad.
And then Diana gets her own sidekicks... Though neither Donna or Cassie were 9 years old when they started, probably lol.
Also funny that Dick basically became like Batman, so that failed... Unless you remember that seasons 1 and 2 Batman was actually nice and that Dick was a manipulative ******* first, in that case, he succeeded
.