My 6 year RIR has always had a bit of raspy breathing but just now when I went to lock the hens up I noticed she was rasping more than normal and inside her mouth there was white foam. Not crazy amounts but it was still there. I looked inside her mouth more and it didn't seem to be coming out of her throat or anything. What's wrong with my little girl? I was reading that it might be an impacted crop but I don't have time to treat her tonight.