Here's a link to a chart that shows many breeds,
Dominiques included. They also have links to other sites where you can find more information.
http://www.ithaca.edu/staff/jhenderson/chooks/chooks.html
I don't know how much help this will be to you, though. All breeds, including yours, lay where they are ready. How long that takes depends on many things. One of the most important is what they eat.
When you described her diet in an earlier post, it sounded like she wasn't getting anywhere near enough protein. If that was accurate, even if you have corrected that now, she's not going to finish developing overnight. You'll still have to just wait.
What changes did you make with her diet? How much protein is she getting, now? Do you keep the feed available to her all the time? Does she run around outside?
There are so many things that can make a difference, I don't think anybody can tell you when your hen will be ready to lay eggs.
But good luck anyway, I hope it's soon.
Oh, here's another link, to Feathersite, you might enjoy.
http://www.feathersite.com/Poultry/CGD/Doms/BRKDoms.html
This is their page about Dominiques. They have nice photos of a lot of breeds, and most have pictures of chicks of that breed, down at the bottoms of the pages.