My rescue Nala. Possibly a lab mix??

I adopted Nala 4 weeks ago when she was 11 weeks old and she was only 13 pounds. She was living on the streets and was malnourished and she had worms, specifically tapeworms. After two long weeks the treatment for the worms was effective and she has gotten rid of them. She is now 15 weeks old and weighs about 22 pounds. She has webbed paws and seems to look like a lab other than the fact that she seems to be a little small for a pure lab and her fur is a bit longer than most labs I have seen. Any clue what she might be mixed with or if she even has lab in her at all?