pH of a solution of acetic acid and ammonium acetate
You have some mistaken assumptions.

$\ce{NH4OH}$ and $\ce{CH3COONH4}$ are not molecules that exist.  

The assuption "all $\ce{CH3COOH}$ is consumed" is incorrect.  

Why do you say more $\ce{NH4OH}$ will be formed? How is this possibe? What can it be formed from? 

Review that Henderson–Hasselbalch equation