She de- and re-Cheetahfied her in The Lies by making a serum with a little piece of the Urzkartaga plant, and considering this issue was all about a factory that processed magical mystery flowers it's probably something similar. She also cast a spell to summon Circe at one point.
Etta looks like a completely different person every run and it seems to be a very frequent problem with Black characters - even Nubia varies wildly depending on the book/artist. She's at least consistently been portrayed as chunky, but it's definitely true that the recent artists have drawn her smaller than Nicola Scott and Liam Sharp did. I did think she looked quite slim in this issue but I think we only saw her behind a desk so hard to tell.
Her design in the Dark Crisis tie-in from this week is my favorite in a while though. She's short, fat, and cute, closer to a modernized Black version of the old-school design. Wish everyone took that cue!