What colour are her gums? Should be a nice coral colour. I had a look through my stuff and the panting and racing heart can be from soooo many things like heat stress, heart murmur, stress (eg during a thunder storm if they are scared of it), being unfit, side effect from eating chocolate, side effect from steroids and so many,many more

. Sorry I can't be more helpful

they are very common symptoms. Please keep us updated on how she is.