Welcome to the board, Edgar. The title of the collection is
Softly - With Feeling. Privately printed in 1953, it is a small publication (approximately 6" by 10"; 39 pages). I don't imagine that too many copies were printed.
Copies are probably very hard to find. One came up for auction at eBay about five years ago; its starting bidding price was $105....
Peggy also had a handful of her poems published in a newspaper. One of them was indeed set to music after Peggy had passed away, and recorded by a contemporary singer, Tish Oney, in her tribute CD
Dear Peg. The title of the poem and song is "Burn It Slow."
Ivan