normaly we say dark red comb is ready to lay, but it has been hot and perhaps got a touch of the sun. In the USA some states put suntan cream on hens combs? yes sounds strange to us I know.
If a hen is unwell the comb gets paler like lice, mites needs worming even comming into a moult or a blue tinge is a heart problem.
If she is eating and drinking now she will be fine, may be just one of those things a off day and the heat. My main girls have a open water dish and will walk through the water to cool off lettuce is good to help them cool off but the other end it comes out black runs ( the iron in it) you have been warned ha ha.
I used a old net curtain to try and stop the midday sun on my younsters but the heat even in a open pen was bad for them with no air movement at all so it could have been just the heat she could not cope with.
I like the web site
www.pekinbantums.com they have very good medical tips try that.
