Re: Yesil
Given another level or two and the issue will basically go away - she won't be wanting to use any of it herself (except weapons and maybe armour) but she will accept others using it.
The longer she's around it, the more she will see it's not all bad. Lets think of if as a teaching opportunity.
To date Yesil hasn't expressed any actually hatred to individual characters (ok, perhaps towards that weirdo Diviac, but everyone though he was trouble), and has kept a fairly wide berth of Tindo and Iviana.
Tindo is at a definate disadvantage because of her pure mage nature (being an elf can't help either). Mist, her familiar, is a jaguar and a rather impressive specimen at that, so thats a point in her favour.
Iviana has two things going for her - she's a fighter and she's also a cleric/witchdoctor/wisewoman. She may be a half elf and dabble with magic, but her focus (to Yesil) is on combat and religion. Memento
Vivere, her familiar, might be a weasel, but that's sort of strangeness is to be expected with these wisewomen....