No. Show birds are bred to be very, very large and conform to a standard. For some reason, in White Plymouth Rocks, some breeders have bred their White Plymouth Rocks to monstrous sizes and do very well with them. Even if the sizes are larger than what the standard calls for. I am not bashing those breeders as it takes hard and rigorous breeding programs to get birds to those amazing sizes. But if you were to compete with your bird against birds that are bred to be exhibition fowl, it would not be much of a competition.
For 4H, she should be fine, and especially as a pet. Production birds are bred in order to lay many eggs and somewhat resemble the desired breed. Exhibition fowl are bred to match a standard, no matter the egg-production values.