Although the Undead Tribe will also go to Kalinsan, their apparent employer Vila was only influenced in will, not directly controlled… She couldn't possibly actively help the Amanata Believers, much less fund their wars.
At most, she might help indirectly… For example, she might happen to take interest in a forest occupied by Air God Creatures, which were coincidentally fighting against the Amanata Believers.
Both Hill and Celene clearly understood Shaer's hostility towards Amanata; suggesting that the Followers of the Night from Tethyr would cause trouble in between was too normal… But what did that have to do with them?
Celene only wanted to protect the Sun, not Amanata, who was born of the Sun… Anyway, if this Sun God were tricked by Shaer, he would just fall back into slumber again.
