It is stupid. Absolutely Stupid. Never did I say that she shouldn't search for vikir, just her method is pure stupidity, read my comment again.
First of all, she made a contract with a demon, the baskerville clan's worst enemy
Second, the special power she gained in return was just a search ability
Third, she risked getting possessed by the demon even if her will is high.
Fourth, She's using black magic in public like a dumbass to find night hound even though she should've made an educated guess by now that he's in the academy and if not in the capital from the rumous on night hound.
Fifth, From your own words, the place he "died" was a 90% death rate area, so he couldn't have moved. If he had died, he would be near the madam's nest or where the madam attacked at Le Rouge et Le Noir mountain.
Sixth, The baskerville clan knows vikir is alive and where he is. Yet she contracted with a demon instead of contacting them.

And no, Even in desperation, I have at least 5 braincells to know not to make such braindead decisions. In desperation, my thinking ability would fade and I would be emotional, but even so why would I contract with a demon..... An upper 10 one at that, to find someone.

Bichir is in contact with demonic artifacts like Beelzebub, Decarabia, Dantalian's Mask or Andromalius' ring. By what has been described, a demonic contract can be made with the demon not taking over the host, the demon tries to erode the host's mind like with Seth van Baskerville or Quilt Lun Indulgentia, and then consume their mind and sould and take over. So making a contract with a demon is akin to have demonic equipement.

For me, 2 and 5 are the same. If the undead attack bystanders then would be bad but so far It seems like Camus is in control and wont attack civilians. For me, It sounds like the Quovadis Clan and the Rune Church deemed necromancy as some kind of sin that must be attacked. My comment about witchhunts is because according to history, most of them were politically motivated (Remove adversaries, suppress the population, get land and power).

Can't she ask the grandpa wolf? If she didn't stab her uncle, the uncle ojisan could have asked the Baskerville's patriarch gramps if Bichir was found already. Author must have been bingeing on soju when they wrote this lmao.