Final answer:
When Mara becomes a material participant, she can use the suspended passive losses to offset the current year's income, resulting in a decrease of $7,000 in her current year AGI.
Step-by-step explanation:
When Mara becomes a material participant in the activity, she can use the suspended passive losses from prior years to offset the current year's income. In this case, Mara can deduct the $6,000 income from the $13,000 suspended passive losses. This will result in a decrease of $7,000 in Mara's current year AGI.