Blue Tongue

Has anyone's baby ever had a blue tongue? Our girl is 11months today, and she has been sick with a cold and cough but I noticed about 6hrs ago that her tongue was blue (almost like the whole thing is bruised). Her lips are a normal pink, nails are fine and the colour hasn't become worse or better. I called the health hotline that we have in Australia and they've just said to keep an eye out in case her lips turn blue but otherwise they're not overly concerned. And then silly me googled it, and now I want to sit next to her cot and watch her all night 😥