Does the school allow Halloween decorations? If so, they should allow Christmas decorations. Many people who aren’t Christian enjoy Christmas trees. No one is making this person put one up in her home.
I hate all this political correctness crap, but call it the holiday tree (officially) and you’re in business. This might skirt any religious/legal issues.. On campus, the kids can call it “Christmas” tree all they want. One thing is for sure, the ACLU will do all they can to thwart celebrating Christmas. By the way, does this school have foot baths for the Muslim kids yet?
Yeah, all the Halloween crap has always offended me, a Christian, yet the ghosts, witches, and goblins still hang from every classroom door in October. This person does not have the right to go through life unoffended.
Depending on how much time you have to devote to this, you can do quick things like phone calls, maybe even calls to your local news outlets, or you can give it much MORE of your time and energy by committing to a prolonged fight. It’s amazing what negative public pressure can do to these wimpy schools.