Fortunately, the not drinking/lethargic/dyspneic part is pretty common for recently attacked birds. On a general basis, these things should subside own their own. If you notice she still isn't drinking and is still dyspneic, after a day or so, it's likely something more serious is going on, and...
Unfortunately, determining whether internal injuries are present usually requires diagnostic tests done at a vet office. By the sounds of it, you have done a good job caring for the wound. As you stated she is likely in shock, so just letting her rest in a dimly lit, warm area will likely prove...