How is Mina perfect wife material in the novel Dracula by Bram Stoker?

Mina and Jonathan seem to be made for each other. She is educated, interested in Harker's work, and supportive of his studies. She is praised for her 'man's brain', but she is also compassionate and motherly, tending to Joanathan after his ordeal in Transylvania, looking out for Lucy, as well as the other main characters.