My daughter is 2 and is already legally blind. Her vision is around 20/470 even with corrective glasses, but her vision will likely deteriorate further by the time she is an adult.
You've gotten a lot of great advice already. Assuming you are in the US, certainly contact your school district since she most likely qualifies for services even if she is not kindergarten age, my daughter has been getting services since her diagnosis at 6 months old.
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I'm happy to answer any questions you may have. I've been there myself feeling overwhelmed, just realize that she will be able to do everything she wants, only in a different way.