Here, from the Indian Law Resource Center:

Notice of Appeal – Superintendent Decision regarding Secretarial Election
Notice of Appeal – Regional Director Decision regarding Secretarial Election

Appeal of Superintendent Decision with Appendix
Notice of Appeal – Regional Director Decision with Appendix

And here also:

Susan Masten ILRC

UPDATE — still more materials:

2013-10-24 – Objection To List Of Eligible Voters For Timbisha Shoshone Tribe Secretarial Election Scheduled For November 4, 2013(81311642_1)(81323482_1)

2013-10-25 – Further Objection To List Of Eligible Voters For Timbisha Shoshone Tribe Secretarial Election Scheduled For November 4, 2013(81317063_1)(81323437_1)

Earlier federal court materials here.