Problem: Do "Nelly" and "her" point to the same thing in the following sentence?

Our mistress hired a room for my crippled sister Nelly , and she gave *her* knitting and needlework when she was able to do it, and when she was ill she sent her dinners and many nice comfortable things and was like a mother to her.
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A: yes

Problem: Do "Bill" and "he" point to the same thing in the following sentence?

John promised Bill to leave, so an hour later *he* left.
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A: no

Problem: Do "Bill" and "his" point to the same thing in the following sentence?

Dan took the rear seat while Bill claimed the front because *his* "Dibs!" was quicker.
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A: yes

Problem: Do "Mary" and "she" point to the same thing in the following sentence?

Ann asked Mary what time the library closes, because *she* had forgotten.
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A:
no