Can a parocial school expell my child if she is failing, has an IEP, and has not recieved accomidations in the least restrictive environment?

Parochial schools are private schools.  They do not have to follow the same requirements as public schools.  If your child is having difficulties, she might be better off in the public school where the school is required by law to make the accommodations.  The public school will have other children who need the same accommodation and will be able to provide better services.  Many parochial schools are smaller, and have less students than the public school district and therefore have only a few students who need accommodations and cannot provide those in the same way that a public school can.