Head through the door to reach a familiar area again. Go around the pillar and turn around to find the final Mr. Everywhere Statue.
You'll now need to go through the Old House and watch flashbacks. These cannot harm you at all, and you should save your ammunition. The flashbacks appear at these locations: Go up the stairs, in the hallway. Then at the Attic. Then in the kitchen and the back door. Then go to the Living Room. After this, the house will shake. Head up to the Attic one more time for the Final Boss fight.
When you approach Eveline during the first phase, use the left bumper (LB / L1) to block blastwaves every few seconds, then run towards her again to get closer. Try to reach the second doorway and move to the left to get into the room. A scene will play.
You now have to essentially unload all your firepower onto Eveline. Unloading a Magnum clip onto her face will essentially do the trick. If you're not so fortunate to have saved up this much Magnum Rounds, use your Grenade Launcher and Shotgun. In the final phase of the fight, unload your Machine Gun on her face until you're dropped to the ground and a special weapon is dropped next to you. Grab it and shoot it (nearly) empty on your foe to finish the fight.