Does she want a full size or a miniature dachshund? Growing up, we had some full size and they were pretty tough. They still had back issues as well. Currently, we have a German Shepard and a Bassett. When the GS gets a little too rough, the bassett puts him in his place. The Bassetts can have back problems as well. I would say make her keep on researching and then get her what she wants. Christmas is coming soon.