Maybe she doesn't eat out much because it is too expensive. Maybe she eats out of a vending machine most of the time.

Taco Cabana is better

You're not missing much.

Never been to one.

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She was excited they were getting to socialize with Raymond Cocteau and that he was (pretending to be) pleased with their work. It's like having dinner with the president.

Do you seriously think that someone of Cocteau's stature and means would take them to a hole in the wall?
And while yes in the real world the term 'franchise' means restaurants that serve the same standardized food, this is a future where it would not be inconceivable that Taco Bell has acquired some kind of blanket trademark rights for the restaurant industry, to where any and all restaurants, regardless of their menu, must be named Taco Bell and kick back franchise fees.

But if they all serve different types of food then Huxley wouldn't know which Taco Bell Dr. Cocteau was inviting them to. So why would she be so happy if she didn't know it was going to be a good restaurant?
The movie said Taco Bell won the franchise wars. A restaurant franchise generally serves the same types of food in each restaurant. The only time it really differs is if it's located in another country.

It just means all restaurants are NAMED Taco Bell, it doesnt mean all reataurants are the same.