Thank you all for all the excellent feedback!
I hadn't really focused on the idea that there may well be a lot of line-huggers, statistically.
DD is stronger in language skills than math. She is also a strong auditory learner and struggles more with spatial relationship/visual stuff.
I think I have been operating under an assumption that there will be a strong math/engineering focus at the gifted magnet that might work to her disadvantage, but it is purely an assumption (because math/science projects seem to get the most program publicity, maybe).
As was suggested, I will see if I can talk to the coordinators to get more detailed information about the program (and DD) and see if I can observe.