She's a hound. She has drives. If she didn't, she would return to you right away when you called her. But she has hound drives. They're not the sort of drives you're accustomed to.
This has nothing to do with little dogs. My tiny beagle has an awesome recall, the best in her advanced obedience class. I have met plenty of big dogs that are badly behaved, pull like crazy, don't return to their owners and frankly, are dangerous because they're so much larger. It's not an us vs. them situation, and I think it's unfair and frankly counterproductive
when we look at it that way. They're dogs with owners that are ignorant, lazy, too busy and just in over their heads (and that happens a lot with doxy owners. These are dogs bred to hunt BADGERS. Do you have any idea how tough badgers are? So that gives you an idea what you're dealing with when you work with a doxy.
First thing, Virginia think it's great what you're doing. The fact that you were able to train her sit so quickly says she is bright and capable of learning.
Now, ASAP -- set up a "air lock." Get an ex-pen and put it around the front door. If you need one around the back door because you use it often, do that too. If you have to buy xpens, do so and give your friend the bill. Better that than vet bills, animal control fines or worse, right?
Now, you open the ex-pen, step in without the doxy, then open the door. If you can get her to sit before you step in the ex-pen and treat her after you step in, you're already on the way to training her to wait. That's a start. But in the meantime, you've set yourself up an airlock. She can't bolt anymore.
Management is always the first step to training a dog.
Next, there is something that turns her on. It may be that you have to get one of those rat-scented pelt things that JRT people use for earth dog training. But there is something.
What I would do is let her miss a meal. Get her good and hungry, then do recall training with the best smelliest meaty treats you can find. Since she tunes out human voices, a clicker might be REALLY useful. If this dog gets non-stop lovey-dovey talk, then a clicker may be the only thing that gets through. I'd start using it on the sits, then try it on something simple, maybe a trick that she seems inclined toward. Or just a down. My hound trained fine with treats and praise, but when I started using a clicker, her game improved a lot all at once. (Be sure to charge the clicker well. I've read that it isn't necessary, but why not?)
Then, start on recall training.
In addition, I would try calling dachshund rescue groups and asking them for tips. They don't even have to be local.
That should give you a couple day's worth of stuff to keep you two busy.