How do you know about their popularity?
there was a vlog where they were chatting and Ava was very clear that they weren't friends when they were younger because Kaci wasn't cool enough for Ava to associate with - but, by total coincidence
, DvG began to become popular on YT and gain followers on social media, and suddenly Ava decided that Kaci would an awesome friend - very obviously because she realised she could use it to her benefit! and it's worked, as not only are people aware who she is, she's involved in modelling etc, plus being treated by Joel and Sarah as one of their own daughters, she's had so many free holidays all over the world, expensive gifts for birthday/Christmas presents and boosted her own social media career off the back of DvG. I'm not saying she dislikes Kaci, but their friendship is far more for Ava's benefit than I think Kaci realises. sure, they have fun together, but Ava is in it for what she can get, and i genuinely don't believe there friendship will last once the DvG association is no longer beneficial to Ava. equally, i don't think they would ever have formed a friendship to begin with if not for DvG starting up on YT, as the way Ava spoke about Kaci prior to their friendship was very much from a position of believing Kaci wasn't good enough to be friends with her, that she looked down on her and even described her as a "loser" - I guess maybe to Kaci, even if she was initially aware that Ava was only making an effort with her to try and get in on their social media success, it was potentially a trade off if it meant she was able to get into the popular crowd - but even now years later, it's very clear that Kaci still looks to Ava for approval, which kinda implies that she knows Ava holds the cards in their friendship and doesn't want to risk messing it up.