Training in a guest house
Your first meeting with Mia will not be very difficult - she is needed to master the combat mechanics of the game. Since the first encounter is face-to-face, you should be as close to her as possible and watch her attacks to block them. The whole fight with Mia basically goes like this: block - your attack - repeat the process.
Attic
Before you fight her in the attic, you must make sure to take the pistol off the table and collect enough rounds. After that, go upstairs.
During the second fight, Mia will have a chainsaw that will easily send you to the next world. All you have to do is keep your distance. So, quickly head down the stairs and avoid direct contact with the boss. Miya doesn't move too fast, but it's best not to risk it.
In addition to this, it would be good to block her path with various objects. By doing this, you will force her to destroy objects before she can get to you. This will give you extra time to stay at a safe distance and even get some accurate shots.
As for Mia's weak points, you should always aim for the head, as this will allow you to stun her much faster and end the fight. As mentioned earlier, you must prepare well for the battle and collect enough ammo.
