I will come out of the closet as lactose-intolerant. But just for you, Jackie. No one else gets to know.

I keep a supply of Lactaid tablets with me at all times, so I seldom say no to things with lactose in them - I just pop a pill when I start eating and I don't get sick. I have to say, I eat less ice cream than I did before I developed the intolerance (in my early 20s) because it is just like drinking a glass of milk (which I don't do), and it usually requires two pills instead of one. But that's for the best anyway, really. Less visits to Comfy Cow and less pints of Stephen Colbert's Ben & Jerry's flavor, "Ameri-cone Dream" are better for my waistline.
That being said, I eat copious quantities of Greek yogurt. I love the stuff! And I don't have to take a pill with it, ever. I learned from a doctor several years ago that yogurt doesn't have lactose in it. I had been abstaining for years because I just assumed yogurt was a lactose bomb akin to ice cream. Once I learned I was wrong, I began eating yogurt again. Then, when I discovered Greek yogurt, I never looked back. I love the sourness of it. My favorite thing to do is buy one of the big containers of Fage and portion out a serving for breakfast, then add a spoonful of jam or preserves. That's a lot cheaper than buying the individual Fage cups with the fruit already included. In my opinion, don't bother with the brands like Dannon, Yoplait, etc. Their Greek yogurt falls flat. Stick with the (sorry) more expensive ones, like Fage, Chobani, Oikos, etc.
(Disclaimer: there are degrees of lactose intolerance. I am told that some people aren't helped by Lactaid pills. Some people are so lactose intolerant that their tummies can detect trace amounts of lactose in some prescription pills they take, and it makes them sick. That's not me. I can get away with eating certain types of cheeses, desserts, etc. without noticing anything. So I don't know where your friend stands on the spectrum. I can only speak from my experience.)