Exatcly, and how you look to others is everything in the Game.
No one would know exactly it was her if she suceeded. Just a few rumors. They would have seen her as more strong than ever.
She didn’t because it would ignite the civil war, it’s stated as such in the book.
A statement not clear without even an explanation and hard to believe. If the man is dead, everyone will be behind her again. Several times she states that she can win the nobles, that means that they are not really strongly behind anyone. Just interested at best.
And if she did that, she would be the one viewed negatively rather than Gaspard.
Celene had no choices. She rejected the last soluton that could avoid the fight and Gaspard would act. She needed to kill him before he could gather any force or throw any attack beginning the rebellion. There was nothing worse than waiting and doing nothing. Gaspard was only the real man able to threat her that much, without him, there would be no one that would try something for a while. She needed time to take control of the situation. All the nobles would be scared by her victory and not at all united. The might of the empire was with Celene without Gaspard.
Yes, Celene would have been viewed negatively ? And ? That would have done nothing concretely.Just something scandalous. Maybe a " bad " reputation. First killing Gaspard discretely, people could only suspect her and especially in Orlais, that's enough, and second being viewed negatively is nothing concretely compared to what we are talking about. It was not about elves here. She would have no opponents anymore, for a while at least.
This reminds me of Henri III. Gaspard was like the Duc de Guise ( except this one wasn't a soldier )
A threat for the king, and a threat for the unity of the kindgom of France. He was loved by the ultracatholics, by parisians, he was the true king for them. Henri III had no other choices but killing him discretely, otherwise it meant civil war. Yes, people suspected him, henri III was more hated after that but he succeeded, he saved the kindgom and his throne from another fight.