Depending on where you got her from, you should have all the paperwork claiming ownership of her. Also the shelter should have her paperwork regarding they waited for the owner to claim her before putting her up for adoption. There is a statute of limitations in terms of all of this and the previous owners failed to make them. You are the owner now, on paper and eventually in your dogs eyes.
Now, if someone comes up to you saying they looked high and low for her, they can't really do anything to take her back unless you decide to give her back, but that would have to be your decision. Im sure the situation won't happen so don't worry. Enjoy your new love! Glad she's doing well
