How do I know if a Elise is lactose intolerant

I started whole milk of few days ago and she likes it but she is pooping a lot more and the consistency of the poop seems watery is this normal?

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01/03/15
I called the pedi today and the kids on call nurse has no idea what are the symptoms of Lactose intolerant are Smh She said I have to call the doctor on Monday. She just said to stop milk and give starch and over the counter prebiotics which I have no idea what that looks like?
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    01/03/15
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    01/03/15
    how would the pedi know? She doesn't get tummy pain from what I see she doesn't seem irritable but she does fart a lot lol and gets loose stool. I wonder if the WIC will change the milk if that's the issue?
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    01/03/15
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    01/03/15
    The farts stink but not like eggs not sure lol
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    01/03/15
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    01/04/15
    It's like 2% nasty? Lol
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