RoyalGuard, I know you are getting tons of information, and I applaud you for reaching out and looking into all the different options available. Your daughter is so luckily to have someone who cares.
When you get out and talk to most deaf people, through writing or speech, you will see that most have problems with English. This is because, as you now know, it is extremely difficult to learn a language based on PHONETICS when you can't hear. Whether or not one grows up using SEE or ASL, a deaf person is probably never going to grasp English as well as the average hearing person. Of course this can be more or less debated, but that is a basic truth.
As a hearing person, especially when I've been the student of deaf teachers, I have had the opportunity to gauge many deaf people's English skills. The deaf people I meet who can read and write the best are those who have deaf parents, and who used ASL as their first language. They have then approached English as a second language from the age of 5 or so in school, and been able to do quite well. Deaf kids with deaf parents have significantly higher test scores than deaf kids with hearing parents. This is because they were exposed to a complete language from day 1 that was fully accessible to them. They had the same advantages as hearing children. Deaf of Deaf are often leaders in the deaf community, not only because of their heritage, but because of their abilities to express themselves well. 70% of hearing parents with deaf kids don't sign, and many who do don't sign well, so you can imagine what happens to deaf kids when they go that first critical 5 years with limited, if any, language.
Even deaf children who have had SEE from day 1, (which almost never happens but I have met one) don't read and write as well as deaf CODA's, (Child of deaf adults, a CODA is someone who has deaf parents, usually it is used to refer to hearing people with deaf parents) because SEE is a code put on the hands, and English is not naturally a visual language, and the grammar cannot always just be "figured out" by a deaf person. I mean, a deaf person can't usually tell if something "sounds right" in English, by it "looking right" in SEE.
Speech therapy and oral skills are truly great to have, the more languages a person can speak, in whatever form, the better.
I know you will be a GREAT parent, no matter what language or combinations of languages you use, because you care about your daughter so much. Good luck with everything!