Oh hon, good luck. I work for dachshund rescue and just remember, she's just scared. Sounds like these people had her crated a lot. What if one of the kids hurt her? We probably don't know all the details. Start off with lots of love. She needs to unconditionally trust you. Than everything will start falling into place. BF can start with the treat tricks. Don't push her, she'll come around. Just keep people away from her right, IMO. She needs to just bond with you guys. Tons of great advice on this forum.
Thanks Tricia for my gorgeous siggy!!!