Beckee's post did make me realize that I could be jumping to conclusions b/c academic failure to thrive isn't only caused by LDs. On the other hand, some of what the OP posted in her other thread does sound highly suspicious for a LD, especially in a gifted child,
Now a rising fifth grader, who has atrocious spelling. C- student. Still reversing B and D (own name starts with B). Cannot consistently use conventions such a capitalization, periods, apostrophes, and commas. One of the examples of her work that caused particular concern: "setens" for "systems". A few more: "one" for "on". "fier" for "fire". "missippi" for "Mississippi". I could go on, but you get the message.
Also: omits, alters, and adds small words when reading aloud, like the, an, on, there, etc.