She was a charlady for NASA, and the James Webb telescope was getting a little dusty.

Blanket doesn't rhyme with ask it, so I prefer basket. And if you have "FOR under her arm...", then the preceding question has to be about what she was up to, not where, doesn't it? So I like "What she did there I couldn't but ask it" as the next line. Nineteen times doesn't scan, and it looks like a corruption of Ninetynine times, which is not as good as Seventeen times, because Seventeen is even and Ninetynine is dotted, and Lilliburlero mixes dotted and even beats, but they're even there. Some genius has posted this on youtube (www.youtube.com/watch?v=ssw7cn2TbF0), which is etched on my mind from formative years . . . but others may have different etchings, and different conclusions.