If she did full flavor, do 24. BUT, vapor hits differently than smoke, so expect mixed reactions both in beginning, and within a month of quitting cigs. Also be aware, nic levels CAN be all over the board. I was unltra light smoker, but required 24 mg to get off cigs, and I know ppl that did full flavor that do 12 mg in e cigs. But to start, Id suggest 24 mg dekang menthol.