Will flat head go away?

ok i have a 3 month old and she has a flat spot in her left side because that the way her head turns when she sleeps. we have tried everything to stop it. we have rooled up a blanket and suported her head on the left so she pushes on the right, tried sleeping her on her side and we do tummy time as much as possible. she sits in her boppy bouncer and takes her napes there and her head still goes to the left. same in her swing. all her toys are on her right and she looks at them but when she falls asleep she falls left. with this spot fix itself eventully? im geting really worried she will have a huge flat sopt for her whole life.....