Yeah, reading this, I really want to know why the mother won't just take the "wine only" option.
I don't feel like the Catholic Church has a reputation for being particularly accomodating (although it certainly varies by diocese and even church) but in this case, it really just looks like the mother is being a pain in the a**.
And on the food allergies. . .well of course there are serious and legitimate allergies, but I do think its one of those things that's often exaggerated or overstated. I frequently tell people I'm allergic to onions because I hate them so much and otherwise they'll insist "try it, you'll like it."