Well, it really depends on if she's still nursing, what she's eating, etc. But unless she's eating lots of pastured lard or fortified foods, I guess you can figure she's not getting much.
Personally, my daughter gets 12,000IU per week, and she's two and weighs about 35 pounds or so. I make sure to balance that with plenty of Vit A (I try to do this from animal sources since veggies generally only contain beta carotene, which is harder to synthesize into A) and magnesium/calcium, along with K2 (from butter). It's a difficult thing to get all these in, but they really do all work together to bind the D, etc.
Keep in mind that I'm sort of making up from when she was exclusively breastfed/not supplemented with D and I found out when she was a year old that my D level was so low that it was one point away from qualifying me as having rickets.
