I wrote about Kulla a lot (she is a major character during the period of Christine's captivity, then is instrumental in leading Raoul and Christine back to Erik's hut when they come searching for him), but don't appear to have actually *blogged* about her during the writing process, with the exception of a brief mention of "the calf-kissing episode"!
She appears -- simply as 'the cow', as neither she nor her calf had been named at that point -- in the original plot summaries at some length: https://igenlode.dreamwidth.org/111957.html#cutid1
https://igenlode.dreamwidth.org/112466.html#cutid1