Liver?

My 6 month old had a check up today & i told them about her gray poop that happens once inna while and they told me to keep an eye on it cause it could be nothing but then it could be here liver but wouldn't she have other signs then just her poop? She still poops green and yellow and dark green and blah blah but some times she will have a nasty gray color

THE GRAY DOESN'T HAPPEN ALL THE TIME!!!!