Louise probably could at least try to blame Eleanore, especially since I think the frame up that occurred is probably not going to help Eleanore's case.
I doubt she will though. We are talking about Louise who was freaking out at the thought of killing Eleanore with the gauntlet on.
And given that it seems that Eleanore while being as mean as ever probably isn't going to be acting as herself- well Louise got knocked out after her sister's speel here:
It's calling to me too. It's warm. Like kittens. That… that utter bastard. That's what he was breeding us for. All those carefully selected spouses with links to the old royalty."
Well, if Louise can remember her "mine, mine, mine" and Eleanore's words prior to being knocked out then Eleanore's actions are probably going to be minutely more reasonable to her. Especially if the gauntlet isn't subtle with the personality change.
I'm not going to let you keep that thing!" Eleanore grated between clenched teeth. "It's probably what corrupted you!
I mean Eleanore looks to have been completely correct here, or would have been if Louise was any less stubborn as she is. Given that Louise has been slowly been turning evil I'm not sure which is right.
I do not need to. I wanted to get you alone. So I could talk to you in without you feeling that you have to lie in front of your subordinates." Eleanore cracked her neck, eyes narrowed. "Louise. Why?"
There's a reason for why the tone of the update shifts here. Eleanore is supremely arrogant, mean and convinced that she knows best. Especially with her youngest sister who she just bailed out of a fight with a dark goddess.
Eleanore also cares about her sister, she even
empathizes with Louise:
""I understand the temptation. I really do. When the world seems so very stupid and you're the only one who knows how to fix it and no one will let you. When the world offers you power and it only seems like a tiny little sacrifice that you can give up any time you like. When it just like the only way to fix the world is to start doing the things that you shouldn't, that you mustn't.
"Do you understand? It's the easy path out. But that's all it is. It's easy and it's evil and it's wrong. You need to fight it every day. It's hard and it's thankless and it means having to put up with a lot of very, very, very stupid people. But…"
The arrogance is still there but given that Eleanore has a mile wide ruthless streak she tried to talk Louise down.
From the tone shift onward we were dealing with a tragedy. Neither sister actually wanted the other dead. You had a hero who honestly believed herself to be saving her sister from a mind corrupting evil artifact (and given the effect it had on Eleanore herself she might have been fully correct) and then by virtue of being more vulnerable fell to it herself. And so forth a more immenaitly dangerous evil walked forth.
It says something about this generation of Vallieres that they're terrible at sticking to being Good, but so far they are very loyal to their sisters.