Will there be any required documentation needed to provide for the Dependent care credit this year?

My mother - who also lives with me, watched my daughter throughout the year of 2021 while I worked/looked for work. I paid her in cash and didn't think much of it. Will any documentation be needed to support the amount that I put down for childcare expenses on my return? Also, would she be considered an in home employee? being that she is my mother, and she does actually live in the home with me and my daughter?