I feel like I'm going crazy about this so I could really do with some advice.
I am getting married next year to my long-term partner and my best friend from childhood was always going to be maid of honour. She has now said that she will not come to the wedding as her husband is allergic to nuts and unless there are absolutely no nuts served in any of the meal or the cake, then she will not come. She has also said she won't come without him when given the option.
I might add that she did not ask if this was the case, more assumed that we would change the entire wedding breakfast and cake for him without asking.