It's interesting to know your different interpretation of the rain and waterlilies in "I Ask MY Mother to Sing." I still hold on to my own interpretation, but you can think more about yours and why you got it. Maybe there are good reasons for your interpretation; for instance, how we see culture as being passed down from one generation to another.
But then why do the two women cry? This is why we need to pay attention to the overall meaning of a text.