I decided to give her her regular turnout with the mares - she frets being confined in the barn with no company, and also doesn't drink well inside. She seemed none the worse for wear from her bout of playing yesterday.
She's still looking sore in the left front, but then sometimes takes some bad steps that don't involve that foot. She walks better on the grass, but struggles walking through the mud. I think we may actually have more than one thing going on. She may in fact have a stone bruise in the left front, but she may also have tweaked something in her hindquarters. She's doing a lot of hind-leg resting, switching sides often, and she looks a little tight to me in the area in front of the sacro-ileac joint at the high point of the hindquarters. There's some puffiness in the area just above the fetlock joint in the left hind, and she's got a lump on her right hock that seems a bit tender.
Who knows? She may have twisted or pulled something in her back or hindquarters a couple of days ago, been kicked or done some stall-kicking or body-slamming during the thunderstorm the night before last - she tends to get pretty upset in stormy weather. I don't think turnout is going to hurt her, since there aren't signs of laminitis and there's no heat or serious swelling anywhere. We'll see how she is this afternoon at bring-in - I'll find out then if I did the right thing turning her out.