Let em eat cake...or something like that

My 8 year old DD wants to blog. Part of me thinks..."ooo, how cool would that be for her to start now and have it to look back on later" and another part says "hello, she's only 8". It would be something we would do together and she's pretty creative as far as the writing thing goes. She's very technologically minded and it might help her grow as a writer. Any thoughts out there in the blog-O-sphere? Should I let her "eat cake"?