I like that theory, but the Falcon had already passed through Irving Boys, Ducain and Unkar as Rey later states, so the last hyperspace coordinates may be nowhere near Han. I like to think that she would know where Hosnian Prime was and that Rey would try to take Finn and BB-8 there, but they slipped out of hyperspace on the way. If it is able to be done, it can give us some more word of the Republic early on, however it would be nearly impossible to implement based upon the available footage.