Here is a beautiful passage from the 10th Skandha ch 9, from Sanyal's rendering.
THE AUSPICIOUS SUKADEVA said,- "Once on a time the female servants of the house having been engaged in other works, Nanda's wife Yasoda herself began to churn the curd. While churning the curd she began to sing, remembering the varios songs composed on Ksrishna's childish pranks. On her spacious hips a silken raiment was tied by a Kanchi ( an ornament of that name). At that time milk was trickling down from her breast out of affection for her son; and her arms being tired due to continued churning, the bangles were loosened, the ear-rings were shaken and the flowers dropped down from her locks. Her countenance was marked with drops of perspiration out of toil. Just then Krishna came up to his mother for sucking. By this he delighted his mother and by holding the churning rod prevented her from churning."
I've also read elsewhere that she composed the songs herself extempore.
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