I could buy the Jeremy story-line. Anna's a caring person, she did not want her friend to get into trouble. On top of that she was (is?) a little naive and might really believe she would get punished too if Jeremy went to the police. So he had some leverage, and once she helped kidnap him (and he found out) his leverage grew and thus he can force her to submit to his antics.
But I do miss what is driving her now. And Deep had every chance of putting pressure on Anna with Andrew in hospital. And we know hospital/medical care in the US is expensive if uninsured (and Andrew is not insured). To keep Andrew in hospital and provide treatment Anna could use some money (probably a lot more than suggested in the game). It could be mentioned that this money was needed quickly (within a week). Forcing Anna to make some hard choices where to get the money.
And thus all her choices and all our kinks would be able to fit into the story. Possibly she'd have to borrow from a multitude of sources eg Patrick, Taxman, Ashley and Dylan and whomever else you could think of that you would like to have a hold on Anna.
I have mentioned this before, but I stand by the sentiment that she would not make certain choices without some sort of outside pressure. Money seems to be the easiest choice it is basically already in the story-line. Just needs to be emphasized more.
She's not that naive, she called out Carl when he was trying to play her with the deliveries(she calls out a lot of ppl in the game actually), a lot of her internal monologues show she has really good observation skills while being able to judge a situation well(like she almost always figures out who each of the characters are at first glance, along with their intentions especially creepy ones, while being able to play that to her advantage if the scenario calls for it),and she knows how to control the flow of a conversation pretty well; she's still a smal town girl, but they establish that she knows how to handle herself and is pretty damn fierce. the other problem is that she's not alone, she has Rebecca and Carl, plus she's not so prideful that she doesn't know how to ask for help, so while she's a caring person who wants to help her friend, and she does believe Jeremy's bullshit, it would make more sense for her to ask Rebecca and Carl for advice on the situation, at which point they should point out Jeremy has nothing on her, even then Jeremy doesn't have enough leverage for her to let him rape her, i mean this is a woman who walked into the office of a crime boss after she refused to give him a blowjob(if that's the choice on makes), all in order to make sure he doesn't get her boyfriend into illegal shit, and ask him for help with Jeremy, she's Bold as fuck. Seems to me Deep had an idea of what he wanted to do with Jeremy but didn't really know how to execute it, which is why the dialogue Anna has in the Jeremy path is often at odds with her characterization(she ends up feeling really, naive, and meek especially because she has to "choose" to let Jeremy do things, even if she's aware of his intentions, lowkey reminds me of Ashley from Good Girl Gone Bad, but at least there it was part of her character). Imo the Jeremy path should have been a slow burn that kicks it into high gear after the kidnapping, at which point he knows that her family was involved and uses that as leverage to make Anna his. So now we have somebody allowing her loss of dignity to protect those she loves. This is a scenario i could fully see her submitting to, as Rebecca and Andrew especially are all she has left. If they want to go even farther this could lead to 2 paths where either she can get Serge to finish the job, but now her and her family are in debt to him(which leads to him requiring her and her sister to "work" it off, and Anna can choose to take the "worse" jobs so Rebecca doesn't), or she becomes Jeremy's whore and that leads to it's own path of fucked up shit.
I largely agree with you, Anna is the type of character that needs outside pressure to do this shit, and Deep had many opportunities to do so, with her family being a core part of her character and her biggest weakness, along with Andrew's medical bills. Episode 2 should have focused heavily on her "fall" were she's just trying to dig herself out of the hole created in Episode one, earning money and keeping everyone safe, it would make her slow degradation and exploration of "our" kinks more authentic. Alas it is a porn game, so we can only expect so much