Most are struggling with dating. That's not the same. Ones that give a hard pass to dating either from the start or because they just give up seem to do really really well.
The narrative is always about the single struggle because it grabs eyeballs and sells media. But I don't know of any single woman who is miserable because she's single IRL.
I'm not saying I don't know unhappy women. I know plenty. Most of the unhappy women I know fall in to a few camps. They want to divorce but have children and feel trapped; they're martyring themselves to marriage. They have divorced and are having custody issues with a father who consistently flakes out and creates unnecessary hardship; they want to move on but can't because the ex is playing games and sabotaging them. They're married and stifled, lonely, and bored; they have a dead bedroom and have slipped into fuckmaid status but they won't divorce for various reasons so they're just riding it out. They have too many kids and not enough help at home; they're stressed and overwhelmed and being sabotaged.
Those last two are the most unhappy ones.