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Abigail Mathers (née Winthrop) is a minor character in Grand Theft Auto V. She'll talk to you about her deceased husband called Frank Mathers.
You can find Abigail at the Sonar Collections Dock but to activate the mission you must purchase it for $250,000. You must have also completed the main story mission "Derailed". When Michael comes back to her with all the Submarine Parts, she's surprised to find a piece of evidence that suggests sabotage, she would claim that the police are in on his death, and "intends to take her findings to the FIB." She rewards Michael with a mere $10 and a rare signed autograph from her husband, much to Michael's frustration. The player then has the option of killing her or just letting her go. As you pursue her, she'll still claim that she didn't kill her husband. But if the player cautiously follows her to the city, without ramming her, thus triggering a chase, her destination won't be the FIB, but rather the Airport, where she's more likely to skip town. At this point she'll get out on foot, and scream for help, claiming that you're harassing her, thus, triggering a 3-star wanted level police chase on you.