Tobit is not a Biblical book. Mrs. White's writings are not Biblical books. They at best can be used for an application to make a point, but as Mrs. White says, her writings are not to be used for exegesis (in phrases such as "My writings are not to be used to answer questions such as 'what is the meaning of the daily'" refusing to answer questions addressed to her for matters of exegesis, or answering those questions with it being their job to study the Bible to learn the answers, it is not her job to answer those types of questions.
I have not read Tobit to see how Tobit applies Raphael. It may or may not be a valid message, just in Mrs. White's quotes she is applying the term "archangel" as a way to emphasize correctly that Lucifer was the highest of all the [created] angels. That is the context of her quotes. We need to remember that we need to interpret what she says from her context, and even though she sometimes is surprising when compared to studying the exegesis; that she still does not want us using her for exegesis, but for application only. Thus, when you go to the Bible alone, there is only ONE exegetical, Biblical, archangel, and that is Michael.