I have to agree with vicious.ink, there is no proof that Marina controls Gloria's social media. There's the odd post that's obviously made by Marina because of the extreme ESL-ness, but the vast majority is bland unremarkable twenty-something social media "influencer" language that's very much in line with Gloria's style of writing in Maradonia. Feel free to disagree but I've never seen any proof Marina controls Gloria's accounts, only speculation. In fact, the extreme ESL-ness of Marina's posting contrasts with the usual Gloria fair to the point where I feel like that's evidence it's not her posting in and of itself. Gloria has some engrishy moments but there's a pretty distinct style when she does and it's not the same as the mistakes Marina makes in her writing. I don't know, just doesn't seem accurate to me but if there's proof I'd like to see it too.
I completely agree that Gunter is behind Gloria's illustrious career as the world's youngest novelist. Gloria has zero talent and zero passion. She's more enthusiastic about her 'music' career and even more enthusiastic about her 'modelling'. She's clearly been bitten by the fame monster. I can buy Gunther pushing her to write but I can't buy Gloria being a passive vessel who has no desire for fame and just does as she's told. I'm pretty sure her parents weren't standing behind her in the club where she pulled the classic famewhore maneuver of making out with another girl.