Hi Everett. I can only say that as a singer I find that all melodies have to be learned.....few people can read dots and then follow the melody even if it is written down as a score. Chords will only give a skeleton structure for the melody to follow. I suggest giving the lyrics and chord structure to the lady and perhaps a guide vocal recording. At worst she will put her own melody to suit these chords or maybe even learn and follow your guide vocal. If she is even a reasonable pianist she should be able to come up with something resembling your original. The named chords you put for guitar will be the same chords near as dammit played on piano.