While browsing Toei Animation's DB Super website, I noticed something strange. Something, which in 99% is just a simple art error, but maybe.. maybe there's a small chance it could be foreshadowing?

In her official art, Cus is shown without her angelic halo.:
https://imgur.com/a/g0RVW

Now, it's pretty weird why every Angel on there has one, yet she doesn't. The halo around her is so big, it'd be strange to just forget including it, especially when you have 11 other Angels. And then I realized...

Cus, so far, is the only angel being shown really attached to her Universe. She is also an angel, one of the few who know how to make a wish to the Super Shenron. What if she gets to hoax the Super Dragon Ball wish

tl;dr Reverse Evil-Angel theory. Cus was just so attached to her Universe, she was disappointed that she couldn't do anything to prevent it's erasure. She proceeds to hoax the wish and become a mortal, while still keeping her powers. No longer she needs to stay neutral and obey the rules.