I may be remembering wrong, but I agree if you mean the Council of Sorcerers. Not if you mean the Lodge. Yennefer really had very little say in the latter since I don't remember her becoming an official full memberShe may not be around so much but she didn't exactly do much wrong either. If you count her working for the Sorceress you can't fault her so much since Yennefer was part of that as well and did the same things. Hell Yennefer was her superior in fact and could order her around.
Basically Geralt has had to deal with their little plans and schemes for some time, but they always try to help if not save him when they're able to do so.
by her own choice at least
Also, in defense of Yennefer, everyone was an asshole in their own way which is why I love the characters so much.