If she has real property then a trust is the ONLY way to go unless you want to be in probate for months and give a lot of money from the estate to the lawyers and the court, not to mention "death" taxes - thank you Obama/Nancy. A will is part of the trust along with advanced directives. If she has less than a year to live you will need an additional document besides DNR or what is in the advanced directives. See this site for more info on POLST http://www.ohsu.edu/polst/

The POLST document is very specific about what measures or not to sustain life. It is a physicians order based on thr wishes of the patient.

The only "radiation pill" I could find, bedsides radioactive iodine, used for thyroid cancer treatment), were ones to reduce the effects of radiation in the event of a nuclear attack.

Radiation typically used in cancer treatment is either gamma, such as Cobalt 60, or more typically, ionizing, as from medical linear accelerators (LINAC). Gamma is typically only used in third world countries now. As it's potency diminishes it can cause horrific and permanent skin damage.

They have developed a brachytherapy technique that has 2 forms: one, is they implant the radiactive seeds directly into the tumor then remove them later. The second way is with a seed that can be charged, from a LINAC, then left in place and it simply disintegrates.

http://www.radiologyinfo.org/en/info.cfm?pg=brachy

It's not often used for H&N cancer however.