If the novena is for a discipline, I don’t see a problem with that.
But I do see a disconnect between praying and novena, and expecting it to “accomplish” a certain thing, and further to say it failed if it doesn’t.
I don’t think it’s as technical as “the answer being no” – personally, and I know others’ opinions vary, but I think it’s almost superstitious. Like a magical incantation. Like if I hold the eye of a newt a certain way and pray a certain sequence, that’s the secret key that unlocks a door.
And if our worldly mind does not see that door open, or close, or whatever it is we were trying to badger God into doing, then we say the prayer “failed” or “passed”.
That sounds to me like putting God to the test, and then trying to figure out why He failed. Or did we fail by not following the schedule perfectly – or maybe our minds weren’t quite disposed right and we have to fast and go to confession and try again…
One thing about the “persistent widow” is like another poster mentioned, being a nag to God, where Jesus says, "but when the Son of Man comes, will He find faith on the earth?
Luke 18:7-8
"Will not God then secure the rights of his chosen ones who call out to him day and night? Will he be slow to answer them? I tell you, he will see to it that justice is done for them speedily. But when the Son of Man comes, will he find faith on earth?”
Isn’t this a bit like when they woke up Jesus in the boat? Yes, He calmed the storm but first he told them they were without faith to even have been worried, and to have woken Him up.