Just a mom's opinion, BUT - I have 2 gymmies - 1 is Level 4 and 1 is Level 5 ...
Kadee would do better to compete a year of Level 4 and skip Level 5. Most girls have a 'more winning' year
of Level 4 than any other year. It's nice for them to have a winning year - trophies and medals are nice.
Level 5 is MUCH harder than Level 4 (or Level 3) - tougher skills, longer routines, and tougher scoring, more deductions. Coming
from competing Level 3 - it's would be a frustrating year - competition - wise, for most girls, and I would guess the coaches
know best.
I see Level 4 as a Level where girls get a chance to really get 'polished' for competition - (learning the little things
about presentation that can start to make a bigger difference). Especially if your gym does a lot of uptraining during the competition year, she can still work on her kips (glip and long hand), squat on, dive roll, front hand spring, back extension roll, and cartwheels and leaps on beam, and the front handspring vault. - Notice I am mentioning more than kips - Level 5 has more skills than just kips - though it IS usually the kips that keep most girls from moving UP to Level 5, they still have to do a LOT more , and many girls have trouble with cartwheels on beam.
However, good Luck to Kadee and whatever she (and her coaches) decide!