I agree with Carlos' theory in that video. I thought something similar myself.
Nneka said she knew Wendy to get on the show, but Wendy didn't know sis, so she got mad at Wendy. Wendy relayed that Nneka was using her name for "clout" to her mom and sister, and mess ensued and got misconstrued every which way.
They just can't really talk about it fully because it's off-camera mess that would break the fourth wall.