Take some of your own food? Would she mind? Hopefully she will be a supportive friend and be ok with it. So I'd take lean bacon for grilling, like the above poster said have a poached egg or take frylight, baked beans and then take mushrooms and tomatoes to do in frylight too. That way the breakfast is sorted and it's pretty much the same as everyone elses!
Hmm...lasagne will probably be high in syns, would a microwavable ww one be better? Or could you have salad instead? The pizza could you have a pasta dish instead as lots of people enjoy some pasta with pizza that way you could have a bit of salad with pasta!?
I know it seems anti social bringing your own food or changing your meal to suit your diet, but as long as your friend understands its not that you don't like her cooking or plans it should be fine...at least this way you'll be able to syn some whisky lol
Have a great time! Don't let what you are eating rule your weekend!