She did not ignore a law. The only law she had to rule on was O.C.G.A. §21-2-5. She ruled it did not apply due to previous case law.
Doesn't seem to be much wiggle room... This chapter shall apply to any primary to nominate candidates for any federal office.
O.C.G.A. §21-2-5(a) - Every candidate for federal and state office who is certified by the state executive committee of a political party or who files a notice of candidacy shall meet the constitutional and statutory qualifications for holding the office being sought.
Every party certified candidate shall meet the constitutional qualifications. Not much wiggle room there, either.
Referring to:
1) Welden's Proposed Findings of Fact and Conclusions of Law, Filed Feb. 1, 2012
2) Georgia Code at http://www.lexisnexis.com/hottopics/gacode/Default.asp