Just rewatched The Roaring Twenties and I too think it's a good watch, sadly the rest of her 30s output is not readily available to me at this time so that remains the sole one of hers from that particular era that I've seen (I do know her from her 40s work as well though).
It's too bad you couldn't find Four Daughters I think that would be a very popular movie, as John Garfield turns in one of his best performances here as a self doubting man who believes everything in life is stacked against him. He takes the movie from fun and charming to a whole new level.
If you, or anyone whats any help locating movies, I'm usually pretty good at it and always happy to help