I saw people discussing this on Twitter but I couldn't find the tweet - this is really a much smaller deal than Twitter (and this thread) is making it out to be. The way I interpreted it, Dinah is aware that management just tweets things from their account without telling them, so she was jokingly showing people that management's tweets aren't in sync with what the girls are actually doing. The last time 5H was in the studio, management flat-out tweeted "We're in the studio", not something vague or general like this, so it makes NO sense that you're all assuming they had a studio day and Dinah wasn't invited
Dinah is extremely carefree, particularly on social media, so she's not the one to to give serious shade to someone unless she's defending her own group (for example, the whole fiasco with The Vamps). I also highly doubt the girls (particularly Camila and Ally) would be able to keep a recording session a secret from Dinah. This is obviously just Dinah poking fun at management. But keep up your conspiracy theories, I guess
