The quote you mentioned is in no way, shape, of form saying, “I’m an atheist, I don’t believe in G-d”. She appears to be saying what many people who praqctice Judaism by rote feel when their prayers aren’t answered. The statement seems to be merely expressing frustration of seemingly talking to a wall.
Unless she stated explicitly that she is an atheist, you are causing a kitrug right before Rosh Hashanah. Please clarify if she said it clearly or not. If not, the editors are encouraged to close this thread ASAP.