1. See, e.g., A. Phillips, Deuteronomy (Cambridge Bible Commentary; Cambridge: University Press, 1973) 50, & E. H. Merrill, Deuteronomy (New American Commentary, 4; Nashville, TN: Broadman & Holman, 1994) 155. Perjury is legal lingo for lying.
2. The use of 'ed in the Psalms, e.g., should probably be understood in non-legal terms (see, e.g., Psm 27:12 & 35:11). 'ana is most frequently used in direct speech to refer to the act of response, and occurs more than 120 times in parallel with 'amar, "to speak"; it is also very much the language of prayers, and used more than 50 times as such in the Psalms alone.
3. Not her real name. Tragically, Rheena is only one of a number of similar cases we know.