World of Thedas backs up her statements, saying that the Dalish as a whole shun spirit magic because they don't trust any spirit of the Fade, seeing them all as dangerous.
There are clearly and obvious exceptions, but WoT and Merrill both affirm the same thing, so we have two witnesses.
Let me clarify. They don't see spirits as dangerous in the way that the Chantry does for demons, creatures who any exposure to is practically ground for executions. They're dangerous at best in more of the super-powered child way, they don't understand us or our frailty, dealing with them is making a deal with entites that can't understand us.
I'm referring to the people who were travelling and were attacked and cursed while passing through. Those people could never return to their families.
There's no mention of these travelers, and I doubt many people wander the Brecillian forest without reason when it's known Dalish and werewolves prowl it's dark shadows.