Yeah, it's complicated; you can see one paper here [1] that quantifies the post-divorce earnings gap. It is improving. Anyhow, divorce is a ludicrously bad economic decision for many women. Don't know if that's a factor in the changing rate.
[1] https://www.iser.essex.ac.uk/files/iser_working_papers/2008-... A more recent book: https://press.princeton.edu/titles/7519.html There's a chapter on divorce & child support. Gets pretty mathy. An interesting survey from UBS (the numbers are buried) about female abdication of financial decision-making responsibility in marriages: https://www.ubs.com/content/dam/WealthManagementAmericas/doc...