There's deaf school you may have heard of in Scotland, donaldson deaf school, have you tried there? Forget mainstream, I have worked as LSA in mainstream school with deaf kids, they are rarely in one place (their own classroom) as teachers always brings up excuses such as "oh i forgot to get resources for them" or "they can't take part in a play" "oh the radio aid doesn't work can you do this/that with them in the base!" you can image my fury.
I had good education at my Deaf school even i hated it (i was labeled as posh child due to my privellaged background/where i live), i was mainstreamed 5-11, loved it as my teacher took her time to make sure i am doing well but my parents didn't want me to be chucked in fast pacing secondary school with 30 plus kids in classrooms and the background noise would have been unbearable so they put me in deaf school which i excelled.
CI or not she will learn to speak in her own time at her own accord, I have always been profoundly deaf and aided with HA's since 2, i found my voice at 5 after years of signing/lipreading, and haven't stopped talking since!. I am fluent in both language and do have CI now (recieved at 30!) I have not been stunned by the community when i got the ci, I am much more involved now days with the deaf people than when i was an oral deaf, and there is more and more deaf adults/young adults with ci's (and they still signs!)
I work with deaf children in the holidays, there are mixture of deaf with CI's, HOH, deaf with HA's, deaf with no HA's/CI's, they all play together. The society now days are much better than it used to be 20-30 years ago.
It has to come from your heart, you know your little girl and see what she needs.