I agree with ladymom.
don't let her out of your site!!
As far as the leash goes you could put the other dogs on there leashes too and walk them around the yard and she might fallow. Take her to were the other dogs go potty as she might get the idea faster. It will take a lot longer to train her since she has bad habits already but be patient, be consistent and be positive!! and don't be afraid to use the crate often.
Good luck!!!