I lived for 2 years with a very picky eater, and it gets really really old, especially if you like to cook. Now, I always made a point of trying to include something that my ex-fiance would eat. Now, your mom probably should have done the same, but she probalby figured out of three entree choices, you'd find something you could eat.
Now, I've sadly had to turn into a bit of a picky eater (I have a lap-band), but I never ask anyone to change their menu. Once, a friend made Speghetti Pie for our dinner. Now, I can't eat noodles, so I just ate the topping on the pie quite happily, along with a little salad.
I probably just would have scraped the topping off the french toast and eaten that - I've had to do that with sour cream fairly often. Or, when faced with an entirely inedible breakfast (the ex's mother, while a lovely woman, can't cook, and would make this godawful egg frittata thing. I can eat eggs, but only when not cooked to the rubber stage), I'd just say I wasn't hungry, and sit at the table with everyone else and drink coffee or juice.