Mo' Mommies, Mo' Problems is a side mission in Far Cry: New Dawn. You'll unlock it after recruiting Boshaw. He will tell you about Gina and her participation in the race.
Your mission is to eliminate Gina's opponents. Travel to the location shown on your map. There is a racing track there. Eliminate the sniper found on the guard tower and take his place.
The race will begin. You need to kill all enemy drivers that appear on the track. You can do so in two ways. First way involves using a sniper rifle. You need to eliminate all drivers. The best way to approach is to target them when they are on the straight part of the track (near the starting point).
The second way involves destroying the vehicles. To do so, you need to use remote detonators or dynamite. You need to watch out and avoid destroying Gina's vehicle. In the meantime, you need to watch out for sniper towers. From time to time, bandits will appear on them, who will want to eliminate you. There are flammable barrels near the towers which will facilitate eliminating the snipers.
Once the fight has ended, talk to Gina to finish the task. From now on, she will be available as a gun for hire.