I would honestly not know the answer to this question, as I am not planning on using her at all outside of the Elder boss. But it all comes down to personal preference. I'd go with skill if you want her to be able to tank a lot. I'd go with the insight if she's valuable as a long range support. Just like Ambrosia. But then in offense. Her insight is also pretty good with getting those walls down without a lot of effort in Guild Clash. But then again, I'm pretty sure that you've also got some hard hitters backing up your layout. So I'll just repeat what I said earlier: it comes down to the choice of her being the tank or her being a long range sniper with some snowball bombs to follow.