Basically, Princess Fiona's "hot take" on joining the job corps:
First, she says some nonsense about some school project she had to do 15 years ago.
Next - "Y'all can make cherished memories there. y'all'l get to go to putt-putt golf, and movies, and bowlin'. OH! And the time they took us to the ballet, that was wonderful!! But, nah! Fuck them thar job corps. Do somethin" else. Now, y'all let me know if'n y'all got anymore questions, ya hear?"
I imagine she is against it because in between all the fun and frivolity, they were focusing on helping her learn how to navigate life without waiting for a handout.