How Maggie came to our house

I posted a question about Beagles' changing color. Thanks for the pictures showing the changing color on tricolors. I want to tell you how this little puppy came to our house and why I asked the question. Between Christmas and January 1, a pregnant Beagle showed up. She sure looked like a purebred and we couldn't figure out where she came from. We thought she might have been out hunting and gotten lost. We wondered what kind of swain she might have encountered along the way and what the pups would look like. She had three puppies that we saw at about 2 weeks. Only one survived. She was freezing and cold and we brought her in the house at 8 weeks. They were all black and white with tan above the eyes. The longer we have her, the more we think she's a purebred. What do you think?