Read the following extract in which Pip and Estella pay a visit to Miss Havisham. Then answer the questions which follow.
She was even more dreadfully fond of Estella than she had been when I last saw them together; I repeat the word advisedly, for there was something positively dreadful in the energy of her looks and embraces. She hung upon Estella's beauty, hung upon her words, hung upon her gestures, and sat mumbling her own trembling fingers while she looked at her, as though she were devouring the beautiful creature she had reared. From Estella she looked at me, with a searching glance that seemed to pry into my heart and probe its wounds. "How does she use you, Pip; how does she use you?" she asked me again, with her witch-like eagerness, even in Estella's hearing. But, when we sat by her flickering fire at night, she was most weird; for then, keeping Estella's hand drawn through her arm and clutched in her own hand, she extorted from her, by dint of referring back to what Estella had told her in her regular letters, the names and conditions of the men whom she had fascinated; and as Miss Havisham dwelt upon this roll, with the intensity of a mind mortally hurt and diseased, she sat with her other hand on her crutch stick, and her chin on that, and her wan bright eyes glaring at me, a very spectre.
What is Miss Havisham's relationship to Estella?