I used to love this place. I'm giving 3 stars for various reasons.
Nut allergies are a VERY common issue, you should try to cater to these customers so they can have a nice treat with their friends too.
The fact that the employee couldn't exactly answer the questions of cross contamination is highly unprofessional. You should know what that level of cross contamination is, if not then obviously you don't know your ingredients. Things can say "processed on equipment that makes peanuts" "may contain traces of nuts" the fact that she couldn't answer to what extent and thought it was FUNNY was not amusing to me. Yes I smiled back because I don't want to deal with something like that but somebodies food allergy is not amusing.
All she could tell me, very loudly and with laughter is that "We were sued because someone had a reaction" and that everything is made separately but can possibly somehow have a contamination. And a "good luck with your allergy" and laughing on my way out the door was not professional.
I used to even pick up orders to take to California for my friends out there. Now with my new allergy I guess I will be switching to Sprinkles since they at least have 1 item that is completely peanut free and actually seem to care when talking to a customer with an allergy.