The hut is in northwestern Wissenland, which can't be far from Nuln, a city full of institutions of learning. Wissenland Hedgefolk are also associated with Verena, so it makes sense they would value books, although...
Yeah. There's a section in Shades of Empire that talks about the diverse religions of the different Hedgefolk branches, but later in a section about the common communities surronding them it says "the Hedgefolk are not Witches, they are blessed folk in the service of one of the Gods—typically Ranald or Halétha, or so most small communities believe". Either the book is simply being inconsistent, or they are saying whichever Gods the Hedgefolk actually worship, they often let outsiders believe they worship Ranald or Halétha for some reason.
If you don't assume that the book is just being a little incosistent here then you can say this hint that Halétha is universally important to the Hedgefolk, and as another piece of evidence you can point to the fact that Hedge magic has a spell named after Her but not after any other God. I personally think this is just an inconsistenty, though.
As Mopman pointed out, Fellstave uses blood drawn during Morrslieb. Of note is that the section on that hut very clearly implies that the local Hedgewise casts Fellstave on the area, as it says that the local Beastmen and Greenskins seem to avoid the hut and the nearby village.
Hedge magic generally seems to use metaphorical resonances, so you can imagine 'Morrslieb water' could be used in Hedge magic against Chaos or corruption in a 'like cures like' sort of way.
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