All I do is Google:

dachshund rescue Missouri

Here is one of several which came up:
http://dachshund-rescue.org/needhome/us/MO

http://www.thedachshundnetwork.com/resclink.htm

And you can also use
www.petfinder.com

And
pets911.com

what's the difference between those last 2? The rescue I am with is national. On Petfinder, all of our dogs come up under Oklahoma, which is HQ. On Pets911, our dogs come up based on where the foster home is located.

Good luck, and let us know if / when she adopts!