hi love, just go full fat cows milk. She should also be getting calcium from other areas of her diet as well.
My ds is 15 months and loves his milk - so he has one in the morn, one before his nap (just after lunch) and one at bedtime. But he also drinks plenty of water too. I"m quite happy that he drinks 3 cups of milk a day for many years to come (although we'll move to skim once he's 7 or so probably).

I don't think there's a right or wrong. So long as she isn't filling up on milk before a meal; is eating well and also drinking plenty of water - if you are happy to do 3 milk drinks then why not?!

That's just my opinion and experience, so someone will most likely know a lot better than me and probably correct me! lol. hth

oh and you'll love her going onto cows milk! so much easier!!!