Is there even an anti Nami thing from Bella at all? The first day prank seemed entirely random, Nami was just the unlucky person who ended up as the butt of the joke or maybe the only one falling for it lol
Otherwise - and that could of course be because of Nika - shes very very tame towards Nami considering how antagonistic Nami (rightfully) is towards her. Shes not making digs at her like she does with Mila and Vic and never mentioned ayua hanging out with nami or anything like that. Imo she kinda likes Nami since - ironically - Nami tried to punch her in the face.
She adores this kind of unconditional loyality and support and envys it (thats probably a main point why bella values ayua this highly too).
No matter how much Nami antagonizes her, she stopped fighting back (at least in a serious way), any other girl talking like that to bella or trying to punch bella would be harrassed by bella nonstop lol
Shes just a asshat and unable to apoligize, so shes just waiting till nami calms down

the good morning scene in the kitchen was hilarious imo