No, she will not grow much taller, but the buds will fill out heaps more.
Nutrient "lock out", real or not, does not affect flower timing in autos, this is all controlled by genetics.
If you are after a more satisfying yield in future, grow photoperiod (fem) plants and that way you can control the flowering cycle and not end up with one foot plants flowering as can happen with (stupid) autos. (yes, I detest autos!)
You also use a ton less electricity growing photoperiod plants.........autos 18 hours of light a day for the entire cycle...........photoperiod plants, 18 hours a day for a few veg weeks, then 12 hours a day for flowering......do the math, it may surprise you..........over a fairly typical 12 week run (as an example), you can save roughly 330 hours of "lights on time"!.......
12 weeks at 18 hours for autos = 1512 hours of lights on time
Photos = 4 weeks at 18 and 8 weeks at 12 for a total of 1176 hours of lights on time........a difference of 336 hours of lights on time!
I know which electricity bill I would prefer!