There have never been a child support order I received help until she turned 18 but they said they would help until she finished high school now they are changing they mine after I did not file on them.

First its not a good idea to piggyback your question on someone else's thread. This tends to cause confusion. So your question has been moved to its own thread.

Second, I'm not sure what your question is. It didn't appear to be a reply to the other thread but its not clear what your post is about. Can you please clarify.

Can I assume you have a child with someone and are separated. The other party was paying child support but not court ordered. After the child turned 18, they stopped paying.

So you can now go and file on them, if you wanted, but I am not sure the legal cost would be worth what little child support you could now get for the remaining time.