I honestly don’t know. Looking at all the online explanations you get a lot of signs from the past: Crips, Bloods, 18th Street; these are all ‘80s groups, still around in name I guess but splintered, growing out: Barrio 18 for example. Some of them are similar but no matches.
But her hand has a distinct pattern: you don’t drop the thumb like that for typical motions. Might be a “Mi Hermana” generic bit since she’s standing next to Berry, it’s more a fashion thing in that sense.
But the revelations about the money laundering gigs and her association with Fontes makes me wonder: some Sinaloa sub group? Likely not, if she knew what that was and was actually involved, would probably NOT show it. But she’s not too bright. A maybe.
I think she’s just showing the camera her nice finger nail polish. Nothing more. IMHO.