As much as I believe about dogs grieving for the loss of a loved one, I don't think they can do that from a long distance about somebody they didn't know. She may see that you are sad but, if Katie is not herself, and whimpering, the best you can do for her is take her to the vet. That way you'll be sure that she doesn't have any health issues that cause her problem.
Hope Katie will feel well again soon. Please let us know how's she's doing.