Which of the following contains a vague pronoun reference?

 - Jill roomed with Leah last year, but Leah's messiness became a point of contention.
 - Jill roomed with Leah last year, but her messiness became a point of contention.
The first answer choice contains a vague pronoun reference. The pronoun her could refer to Jill's or Leah's.
The second answer choice shows a possible correction for the vague pronoun reference. Her has been replaced with Leah's.
Jill roomed with Leah last year, but Leah's messiness became a point of contention.