We need pictures!!!!!
Is this something recent???
Or, is this a lot of christmas stuff that she has collected over a number of years????
Especially if it is things that may now have sentimental value, you are treading on thin ice!!!!!
If she is making a big new foray into 'doing Christmas' and might welcome some positive/creative help... maybe a few VERY carefully chosen words? (do you have a feminine/gay home decorator streak????) No offense!!!! Just being funny

and pointing out that many men are not going to be the better at this kind of decorating thing. PS: if you do, then come on over to my house and help me out!!!! Maybe you could find a small area that you feel like needs some work... Like around the TV where you watch your games... and ask her if she would mind of you try your hand at decorating right there. If you end up doing a nicer job, you might find that you have just been enlisted to a lot of the decorating work next year!!!!
Some folks are just real Christmas fanatics....
If this is the case... like others said... if this overload is her idea of Christmas Joy... just let her have it!