Hen keeps lying down with her wing out

Mine do  that al the time, in the dust and especially when it is hot...

She is alternating her wings so no damage. I have seen them do this in a dust bath so think it may be just because she's sunning herself but she does it anywhere and in odd places - she's definitely not infested (we checked thoroughly when we lost our ranger last week and again yesterday morning before we introduced the newbies). She's eating and drinking fine. She might be a bit stressed about the new girls - she's spent much of the day posturing and trying to convince them that she's top chicken!!

They spread their wings out when they are hot. They hucker down in soil or their dust bath, spread their wings out and hopefully get cool 

Mine do this.... It is 'sunbathing' and stretching.... Perfectly normal an nothing to worry about.