Well done! It is really hard to get anything published. My wife waited - on her first book - 2 years, then the publisher went bust and took her manuscript. Has your wife tried Firefly Press (Qld)? Last year she received out of the blue a cheque for over $2000. Well, some of it had to go towards a Hyperion EP- didn't it??
She also writes picture books and blackline masters for early primary. That book was called "Special Days" Another good publisher to try is Ready Ed Publications in Perth.
Keep going