OP,
Every area wants to wheedle out of SN services; unfortunately, your grandchild is not alone in this.
That he's doing well academically is probably why they ended services. Schools aren't required to provide every service. They are required to provide services so that a child has
access to education, not success by any means.
Does your grandkid have a diagnosis? Your daughter should probably review the past testing they've done. Also, how old is the child?
Most psychiatrists don't take health insurance. If I were your daughter, I'd make an appointment with a psychologist for a neuropsychological evaluation. It basically will test for things like ADHD, anxiety, language based learning issues, etc. This may not be covered by health insurance either, but it will be less expensive than a psychiatrist. A psychiatrist is most helpful for medication issues and/or ongoing psychological issues.
She can also request testing through the public school. Check out the Wrights Law website:
http://wrightslaw.com
She can also email them and if they have time they will respond.