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Her friends are constantly asking her why her little sister is in her class... DD10 is wondering if she is "stupid" because her little sister is doing the same work as she.
This recent post may be of interest.

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What can one say to the older child that will convince them that they are valuable and special? ... keep a tight grip on the psychologist for much needed help!!!
Your eldest is the same wonderful kiddo she was before her younger sister was accelerated in math, education is not a competition, everyone has strengths and interests which may vary over time, a family is a team, we all win together. Here is a post from last spring when the idea of possible acceleration and social impacts were being contemplated... it includes a few thoughts and a book or two which may be of interest. Does your psychologist have ideas for affirming each child without creating comparisons to fuel potential sibling rivalry?