Ken Eriksen, 2020 Olympic Coach, addresses player "slumps". Slumps are normally when a hitter who has a higher batting average drops well below her normal stats. Slumps, in nearly all sports, are mostly mental.
In order to help a player rebound from a slump, Eriksen says it's important to encourage the player, remind her of her skills, and most importantly, hone in on the basics. Those basics include getting a good approach and seeing the ball as best as possible during the hit.