Is Mistyheart a good warrior name for a gray she-cat?

Yes, that is indeed a fine name.

I agree. Here is a back-up name if you need one:Pebbleheart.

Yeah. That name is pretty rocking. If ya need something to fall back on, I got ya back! XD: Mistypath, Graystreak, Graystep, Mistystep, Silverstep, Silverstreak, Bluemoon, Blueflash, Blueflower, Silverwing, Bluewing, Mistywing, Blueblossom, Fogmask, Foggycloud, Foggysky, Foggystep, Frostheart, Frosthowl, Frostedcloud, Cloudpatch, Cloudstep, Cloudpelt, Ottertail, Otterheart, Ironclaw, Irontalon, Creeksong, Creekpool, Ravenfeather, Raventalon, Puddlepool and Wavewash.

also moonangle,streamheart,and frostwing