My money's on the grandmother.
Based on photos she is a very young looking grandmother! She has been traveling with Alina for the overseas shows and that is reassuring. Also Alina's dad just stopped playing hockey a few years ago. I'd imagine he can take of whatever needs to be taken care of should anything come along that needs to be taken care of. He can bring the Izvehsk hockey team along for back up. And Eteri's presence alone is probably protection enough. I would not cross that woman! I think I'd rather face the hockey team!
In all seriousness, I do hope they get Alina a good agent to manage her opportunities.
Alina also seems to have some good instincts for self-protection. I have never seen a (famous) teenager less interested in posting on IG. She has 5 posts since the Olympics. Not one selfie. Not one pic of her medals, bmw, new phone, or anything material other than the scrapbook she received. She posts IG stories that can't be commented on to thank fans for their gifts.
I think it is a smart choice to limit her exposure to online attention positive and negative.