The Finch catalog (auctioning Montfort's collection) describes her in pretty harsh terms in this description of Scarlet ---
This collection of poems is inspired solely by Bukowski's relationship with Pamela "Cupcakes' Miller. Miller was quite indifferent to Bukowski's intense feelings for her. In the copy of Scarlet he presented her, Bukowski wrote "For the girl who made me write these poems, for the girl who made me feel that feeling which comes so seldom in a lifetime"; Miller barely looked at it, and only brought the book out occasionally to impress her friends. She said of Scarlet that "I didn't have a tremendous amount of respect for his writing. His poetry was often negative and not complimentary. I thought I was just fodder."
Which, by the way, is not at all the impression I got in my correspondence with her.