Is she running a fever? Is she drinking/peeing? I do hope she feels better soon and Id just keep close contact with your vet. If you see no improvement in her by am I would definatley bring her into the vet, maybe even tonight?? She looks real tiny in her avator picture so I am assuming she is and I know how fast these little one's dehydrate.
Keep us posted and Schatzie sends Lexi puppy hugs!