Many of us here have older kids, well past college, who showed various and sometimes intense interests and talents in middle school, and have also watched other kids as they developed.
Kids above all need the freedom and autonomy to determine their own way. Sometimes we supportive parents encourage them to narrow too early, and sometimes rigorous schools get in the way with the intense workload. These are issues that each family has to deal with.
Talent can pose problems, in other words. I honestly tried to never use the word!
The prodigy pianist who is told to practice and whose parents glow with pride early on, may end up avoiding music altogether! That said, I have talked with musicians who say that without parental pressure, they never would have kept with their instrument in middle school.
We can only caution you not to get too invested in your daughter “the writer.” Keep it relaxed. She doesn’t need to publish other than for her own personal pleasure and maybe her friends. By all means she could benefit from a writing program geared to her age, for social reasons as well- but that can also wait.
I really liked the post about the dangers of early success. Your daughter has a lifetime. She needs to evolve and if writing is something she enjoys, great. But she doesn’t need to be “successful” yet. And she may develop other interests over the next decade.
Good luck!