Just a thought and it may not be true in this case- but Level 5 and 6 are about the same so if she did full seasons of both it's almost like repeating a level so I'd expect she would do better.
Could be that she had her "athlete maturity" growth spurt, too. This often is presented as a case against compulsories, but the thing is that levels 4/5/6 often coincide with the developmental stage where kids sort of start doing gymnastics as an athlete, for themselves, with intrinsic motivation greater than extrinsic. This results in a big jump in skill attainment, form, etc., as they are more motivated and can apply corrections quicker.
Level 5 and 6 CAN be about the same, but they don't have to be.
We had 3 girls that competed L5 and L6 in the same season (gym required scoring out 2x before moving up). Took one girl 3 meets and the other two needed 4 and 5 meets.
At L5, they struggled (31.5 average). At L6, they all did so much better (33.3 average). These scores may seem low but beam falls (L5 and L6), stopping between skills on bars (L5 and L6), and sudden fear of a back tuck and flyaway (L5) in one case tend to lower the AA.
At L6, the back tuck girl was able to choreograph her floor routine to leave out the back tuck for a couple months until it came back. The other girls were able to work to their strengths on floor.
Only 1 of the 3 continued with the BWO on beam (the source of the falls). The other 2 went back to a cartwheel or dive cartwheel.
On bars, they substituted a BHC for the LHPO on high bar and flyaway girl switched to an under swing.
On vault, only 1 continued the FHS. The other 2 worked 1/2-1/2 while competing 1/2 on - repulsion off.
Their average AA scores were in L6 were about 1.8 points better and the 2 that continued with the Y team have only gotten better as repeating L6.
One competed High School Team last year. One has just retired (unless she decides to compete High School Team this year). The last one is training for L7 (or at least she will be when we go back to practice - lol).