Santa coming to more than one house...great....you just explain that Santa must have known they were visiting grandma, too. If grandma doesn't want the "credit" for a few gifts, oh well. It will bite her one day when she gives the perfect gift to your daughter from "Santa," and instead of all the loves and hugs directed at Grandma, they will be for Santa who gave her the gift.
Who cares how many presents there are...it isn't like grandma is trying to compete or outdo you...or I guarantee she would have had her name all over the "From" on each and every one of them. Having signed them Santa may be her way of helping you guys with a couple more items to make your daughter's holiday merry...without looking like she is trying to outdo you.
Waldorf method is great for some people...and not for others. She may not even understand what it is...and even if she does, it is her perogative to buy what she would like - it is a gift.
My son has a bunch of friends who attend the local Waldorf School. One family is very good friends of our family. Dad has traveled all over the world, and is one of the most highly intelligent people I have had the honor of knowing. Mom is a Yale Law School graduate...who is also president of their Waldorf School. I was at their house Dec 23rd delivering some Legos and mainstream movies I had shopped for them while in town. They were busy wrapping Havoc Helicopters, Flarp, Legos, and a wood Budda for their three kids (nuff said). Kids can be raised with your values and structure, and still maintain a modicum of mainstream..without it being a bad thing. You can't lock them in a box until adulthood.
Just because you are raising your child Waldorf doesn't have to mean strict adherence to a set of rigid structure or rules...go with the flow..and know that your child is going to encounter your values, and the values of a whole lot of other people that may not match yours...and in the end hopefully you have taught them the importance of choosing what is best for them.
PS: You talk to any Waldorf 4th grader (we live across the street from the Waldorf school) and they are more hip, and up on pop culture, media, and hype than a mainstream student. You hear them singing top 40 songs on the playground. Life is about differences of opinion and values...embrace it...it's much easier.
Added after reading "What Happened:"
I want to apologize if you feel attacked. None of the replies (IMO) even come close to attacking you. A question/ advice forum is not the place for the timid...and certainly not the place to rant or post unless you are prepared to hear some differences of opinion. In fact...that is what I like best about Mamapedia - alternative ways of thinking. If you are looking for complete validation, you are probably better off talking to a close friend or diary in the future.