I would balk too if you expected me to cover your lunch. Eating there, at that time, was YOUR choice. You can NOT expect that to be covered and there would be no legal reason it would be covered. That is all you.
AAA took care of your towing. That is a part of the service. I really think you are reaching when it comes to wanting that money as well. That is why you HAVE AAA.
And many companies and employees would stop speaking to you when you start the threats. Threatening people is not the way to get what you want most of the time. Good luck. I doubt they will now be willing to work with you and will do it line item and not do anything beyond what they are required to do.
Also, once she sends a letter on attorney's letterhead they will be done talking to her as she is now represented by an attorney as far as they are concerned.
OP, I'm sorry it happened but unless there is a warranty on that vehicle than you are lucky if they are not charging you for the fuel pump. They could not know the fule pump was going to go out on the vehicle and as you said yourself they can go out at any time and usually do without warning.