At what age should I drop Moose down to 2 meals a day?
When the time comes do I slowly just cut down her lunch meal
ex: 1 cup and a half to 1 cup ect
till no more, or do you just stop feeding the lunch meal?

Breeds may differ but I have found that my present one (Elkhounds) and the previous (GSDs) took themselves off the lunch time one by loosing interest in it, I did try to keep it going as long as possible though because once they stop the extra has to be split between the remaining two meals.

generally four feed until 12 wks, then three feeds until 6 mths, then down to and stay on two. give or take a week or so, the dogs let you know pretty much. same amount just split into two then the dog gets more satisfaction getting slightly larger meal.

With being a great dane cross should I try keep feeding her 3 meals until 6 months of age?

I added pumpkin in her lunch meal just to try and keep her eating 3 meals a day. Found this
morning she only ate 1 1/2 cups instead of the full 2 thats just the dry kibble. Now wondering if I am feeding her to much.
I no as long as I have something added to her meal she does eat it all.

I am very new to this schedule feeding have always free fed my dogs, but was advised on here
to schedule feed, and I actually like it cause I don't have to have dishes of food down. I also
no exactly how much they eat.

I would feed 3 till six mths or thereabout. if your dog not eating all her meal then cut back so she has a bit less, nothing worse that facing a huge bowlful that you know you cant eat.lol