Part of being 9 is learning what is and is not appropriate in various social contexts. I've no doubt ALL kids use a drastically different vocab hanging out with their friends than they do at home with us stodgy parentals. Even now my eldest, when home from college, is a bit more colorful, though still reserved, in speech with dear old dad (me, btw) that when within earshot of his mother. Aside from pointing this fact of life out, I don't think it sounds like much of an issue: a live-and-learn, experience sort of thing.
My son just started college, taking one class over the summer so he could train with his team (gymnast) and is now in full force. 1. How difficult was it to make sure all classes were accredited? Meaning, the online school our son attended last year was fully accredited. My kids had to suffer with me designing/teaching/grading the whole shebang. Nobody at university seemed to care. They were more concerned with topics covered; so many math credits, so many English credits, foreign language credits, etc. His ACT scores jived nicely with the grades I awarded. One university did admit that they perform deeper investigations, requiring samples of student work, if HS grades are straight As while SAT/ACT scores are below average, and rightfully so. The NCAA were another matter. It was an awful experience and they were very upfront about being far more rigorous (read that as pig-headed, please) than they are for traditional students. They have their own form for home school classes and each and every class, for all four years, requires its own form. In the end I'd created a novella for them and they still hemmed and hawed. If you have to interact with them, start a good year in advance because they are very hard on home schoolers and refuse to use common sense or to move with any sense of urgency. 2. How hard was it to create a transcript for your child? For the colleges, as easy as making a table in MS Word. I included year, semester, course title, text books along with ISBNs, brief description, grade, and credits per class. 3. Did your child have a hard time getting accepted into a college? Got accepted at every college applied to, save one, without reservation. That one college was very frank about being the only large state college available and so out of state students had a hard time due to the thousands of in-state students vying for a spot. It did help that he did well on his ACT. It also helped that he took a couple of dual credit courses at the local university so he had a collegiate track record. Then again, anything that gives your child a competitive edge will help. 4. How did you keep up with everything? Meaning, what was or is the most efficient way of making sure all is completed as it should be throughout these years. I didn't have too much difficulty. I kept record of what he took and "cheated" by looking online at local schools (private schools are pretty good about posting on their websites what credits are needed and what year to take what classes). In the end, I made sure his final transcript had all the right classes with right number of credits.