Grooming mutts all the time, I'm going to take an educated guess that she's likely more then 2 breeds. I have little if any doubt she has corgi in her (cardigan, not pembroke).
The spots of black on the tongue however, are not necessarily evidence of chow. Chows aren't the only dogs that have dark tongues. Just the most popular I would say. Other breeds that share this characteristic are Shar-Pei has them. There are also breeds that have spotted tongues as pure breds. From what I just looked up (cause I can't remember all of it) there are over 30 breeds that have this.
I copied over a short list of breeds here that are known to have spotted tongues...
Airedale, Akita, Australian Cattle Dog, Australian Shepherd, Belgian Sheepdog, Belgian Tervuren, Belgian Malinois, Bichon Frise
Bouvier de Flandres, Bull Mastiff, Cairn Terrier, Chinese Shar-Pei, Collie, Cocker Spaniel, Dalmatian, Doberman Pinscher,
English Setter, Eurasier, Fila Brasileiro, Flat-coated Retriever, German Shepherd, Golden Retriever, Gordon Setter, Great Pyrenees,
Irish Setter, Kai Ken, Keeshond, Korean Jindo, Labrador Retriever, Mastiff, Mountain Cur, Newfoundland, Pomeranian,
Pug, Rhodesian Ridgeback Rottweiler, Shiba Inu, Siberian Husky, Tibetan Mastiff, Thai Ridgeback
So really, your baby could be a mix of who knows what!?! Regardless, she's absolutely adorable!