Abigail has nothing at all to do with the OP. He's not talking about fighting the Beast, but about the optional quest when you save the girl who's about to be raped at night and then escort her to her house, protecting her from spectral hounds along the way.
Anyway, I had trouble with this quest on my first runthrough, although I don't know if it was for the same reason as the OP.
The issue is that there are two quests that generate spectral hounds along exactly the same path at night. One of those is escorting the girl home, and the other is lighting candles at the five altars for the priest guy. In my case, I was already working on the altars when I ran into the girl, so I ended up trying to do both quests at once, which made things very difficult. Normally, the altar quest is easy, since you're alone, but when you have the girl with you being chased by her own hounds, and she then runs in to attack the new hounds that the altar spawns, it becomes very easy for her to die. Still, once I realized what was happening it wasn't too bad, and I was just careful around the altars and used the push spell to break up groups of hounds that were attacking her while I used the group style to kill them. I did have to use a couple of potions, though.
Anyway, I had trouble with this quest on my first runthrough, although I don't know if it was for the same reason as the OP.
The issue is that there are two quests that generate spectral hounds along exactly the same path at night. One of those is escorting the girl home, and the other is lighting candles at the five altars for the priest guy. In my case, I was already working on the altars when I ran into the girl, so I ended up trying to do both quests at once, which made things very difficult. Normally, the altar quest is easy, since you're alone, but when you have the girl with you being chased by her own hounds, and she then runs in to attack the new hounds that the altar spawns, it becomes very easy for her to die. Still, once I realized what was happening it wasn't too bad, and I was just careful around the altars and used the push spell to break up groups of hounds that were attacking her while I used the group style to kill them. I did have to use a couple of potions, though.