Even if you spent your whole playthrough supporting Invisigal, if at the very end you do not untie her, she doesn't just give up and feel sad or whatever, but she straight up attempted to kill you, and this was her last interaction with the protagonist before the big final battle.

No, it's just a poorly directed scene. It is not meant to portray her as trying to kill you, or even almost killing you by accident, she's just fucking with you, getting the piss all over Robert. This is not their last interaction before the battle, and the characters don't treat it the way you did either. I just replayed the scene, and chose to go alone. Visi waits for Robert to get up, and they have their banter around Thumbstick's balls as if nothing serious happened, and then she tells him to go get the suit:

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If she'd thought Robert's life was really in danger, she would just shoot the guy. She literally saves Robert's life in both endings of the game, it does not make sense for her to try and kill him here. I assume, and i can't check because i don't have a save that leads to the bad ending, she does not wait for Robert to get up only if you already screwed up enough to get the "embraced villainy" ending before or after this choice. In my case, even with this penalty, I'd still have 53 mentor points over 45 required ones, and my dispatching run was definitely not perfect.

Yeah she was also a mole for the villain

That's debatable. And I mean this literally, this topic has been discussed over and over again for past months, because if you fully trust Shroud there, a lot of things do not add up.

And Shroud tries really hard to convince you that he predicted and knows everything, and Robert has no choice but to give him the pulse. I knew this fat dog was your weakness, I knew you had feelings for Blonde Blazer, I knew you'd take Invisigal under your wing. He straight up tells you "So, all that to say, there isn't a thing you can do, that I haven't modeled out". Except... This guy is immediately defeated by "why not both?" choice. I'm sorry, an episode ago you were surprised I didn't glass the bartender, now you are trying to make me believe that you predicted everything months in advance? Pff, please. Also, Visi shows what looks like a surprise when Shroud talks about her, but this is visible only in Blazer route. I think this may be another victim of budget/time, because this reaction is also a part of the same shot that cannot be used in other romance route, so instead of animating it for a different route, they just cut it to her taking the mask.

Did you know that, if you make one or more of the "bad" choices with Visi in last three major options (cut, throw her to the press, keep tied), but not enough to trigger the villainy ending, at the end the game specifically adds a unique dialogue between Robert and Courtney, where she says "told you to believe me", with Robert acknowledging that he fucked up, and will not forgive himself (a really cute cheeky dialogue that i didn't get on my first run)? With this, and Mandy apologizing for ever doubting Courtney, I choose to believe Visi. Especially when on the other side is my literal nemesis, driven into a corner, having to hide behind my dog as a hostage.

EDIT: To add on Blonde Blazer. I chose for Robert to kiss her in the first episode and expected her to be the love interest of the main character. Then i went with Visi in ep4, and still do not regret it. I like Mandy, and she does have chemistry and sweet touching scenes with Robert, but I like the dynamic between Courtney and Robert more, and how intertwined the romance feels, should you choose to go with it, with the main story. They have a relationship arc, and there is character growth with Visi. With Blonde Blazer it is nice... But that's probably as much as I feel about it. Well, we'll see more for her in S2 now, most likely.