Wow a lot of responses so quickly. Not sure if covered but your daughter is dyslexic and language will prove a challenge.
So not only will Harvard prove a challenge but most colleges here will.
I think Brown is known worldwide but what exactly will she do with the prestige ? Prestige brings no guarantees.
And how will she handle being four years on campus, day after day after day.
Harvard just accepted 3.4% of applicants. Not sure anyone can say ‘high chance.’
If she does not excel in math or language and science (you noted physics) and she hasn’t had language since 14, I don’t see how you can be admitted to either and many more in the US.
But based on what you wrote Brown is the better choice. And with those who need to know, very well known. I can’t say which gives the best odds but Harvard doesn’t have ED. They have restricted early action and it gives no advantage over RD. Their words. Not mine. Brown says similarly. So REA at Harvard or ED at Brown - choose the best fit. Or better yet don’t apply early at all.
Best of luck.