Found a dog on the street and don't know what to do

On my way home I found a yorkie dog running into the street… It was in a horrible area of town (ghetto) and traffic was bad so it was either I pick her up or she get run over. So I brought her home and she is very friendly but she acts scared around my dad almost like she has been abused. I'm not sure that's the case I'm just saying. She has really bad fleas but she is very sweet and loving. I called the shelter and I went on craigslist but didn't see any ads until I looked and saw one posted about a month and a half ago that matched the description. They said in the ad she got out of the fence a month and a half ago but when I picked her up there's no way she could have survived that long on her own. That area is known for wild out bulls tearing up small animals anyways and is really dangerous. I almost am thinking maybe she got lost again? They didn't put any contact info so I emailed the craigslist account and asked if they found they replied "no" and I said that I might have one that fit the description and they haven't replied! It's been days and they are writing off an iPhone so I know they read it. I don't know what to do. My family is getting attached to the dog and The last thing we need is a dog but I mean we will take it in I don't want her going back to a home that's bad and if they don't care. I'm trying to give them the benefit of doubt but they won't even reply to my message. I'm not a bad person I just want to do what's right. Any advice would be appreciated thanks.

Added (1). I'm pretty sure it's their dog it matches the description and location

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