It's probably just padding or the silicone boob plates, her tits look about the same as they always have if you compare pics where she doesn't use them:
Hopefully she's better at keeping her OF up to date, she was awfully slow at releasing stuff on patreon and elsewhere so it never seemed worth it to sub
Photo editing I can see for sure because a Russian cosplayer I like does the editing to her nipples I think. I do think it’s her actual tits tho and it would be more noticeable with padding