DAD22: My DD was pretty much in the same place as yours when she got to pre-K, and she loved her pre-K experience. She's an extrovert, so she loved the time with other kids. The learning part of the day was not dominant, and DD's ability was recognized immediately by her pre-K teacher, who found ways to keep DD engaged by enlisting her as a teacher's helper and mentor to the other students... for instance, DD got to read books aloud to her class. The students really admired DD for her intelligence.
And, more importantly probably, pre-K was just a few hours out of the day.
Anyway, it wasn't until she got to K that she found the educational experience extremely disappointing.