Hi and welcome.
I see that you posted awhile ago and no one has responded. I'm not the most experienced person here but I guess I'll try.

Has anything happened in the last year or over the summer or since the beginning of this year? Is your duaghter under any stress or had any emotional trauma recently that might cause her to have problems with focus and concentration? I'm confused as to whether she is showing problems all the way around or just in enrichment or only at school, or what. Is there anything going on at school? Is she trying to dumb herself down to fit in with a certain group of kids? Is she feeling self-conscious about being gifted or pulled out for the enrichment?

It doesn't make any sense to me that she would suddenly start showing signs of having a LD. I would think that there would have been signs, even if you missed them, from previous years at school. You don't just all of a sudden "get" a learning disability.

Have you considered private testing?