I can understand your Deaf friend who rejected her hearing parents.
Most hearing parents (maybe not most) get all the feedback from the hearing doctors and authorities that the hearing parents are to be instructed to fix the Deaf child with CI and forced the Deaf child to learn speech and listening while going through the mainstream schools. If there is a mainstream school where the Deaf child are not allowed to learn ASL and can not get an ASL interpreter to help the Deaf child understand what is going on in the classroom with hearing children and hearing teacher. Most often, many Deaf children would rather be in the Deaf schools where they can have the freedom to use ASL as their primary language, not second language. If the Deaf child was refused by the Superintendent of the Deaf school or the School board, then the Deaf child need parents to fight for his/her rights to use ASL and to attend the Deaf school.
Most hearing parents usually don't pay attention to their deaf children because the deaf children get frustrated not getting their needed accommodations that would help them in the mainstream schools. Parents refused to do anything to help them and just wanted them to be like the hearing people, be like the hearing parents. That is why it is not the way to go about it dealing with Deaf children, even hard of hearing children.
For me, I would like to have Deaf parents that understand about deafness better than hearing parents who don't understand nothing about deafness and need to have a mentor from the Deaf communities. I had to suffered from them and they want me to go through the mainstream schools and preferred not to sign ASL at all. Oral method and lipreading were very difficult to deal with. That is why many deaf children wish to have Deaf parents who did listen to their needs.