Based on this uncharacteristic result, Williams pulled out of the Australian Open, which starts Monday, and continues to train.
"I've broken down I don't know how many times".
She said that while she was pleased with her recovery and her progress, she was "not where I personally want to be".
Williams' sights remain set on breaking the record of 24 Grand Slam titles held by Margaret Court - though she won't push baby Olympia to follow her path.
"I was happy to change diapers, but on top of everything she was going through, the feeling of not being able to help made it even worse", he said.
Serena explained, "When I'm too anxious I lose matches, and I feel like a lot of that anxiety disappeared when Olympia was born. Or I'll get angry about the crying, then sad about being angry, and then guilty, like, 'Why do I feel so sad when I have a handsome baby?' The emotions are insane". "I don't need the money or the titles or the prestige". I want them, but I don't need them. "That's a different feeling for me".
"We're not spending a day apart until she's 18", Williams told Vogue. A nurse initially tried to brush off her worries, but Serena insisted and her intuition wound up being right - the CT scan revealed several small blood clots in her lungs. "I was like, 'listen to Dr Williams!'" she says. Not only that, but her c-section scar burst open, whereby doctors discovered that a large hematoma had flooded her abdomen.
Finally, Serena was allowed home, but spent six weeks in bed.
In the interview, Williams also discussed her rivalry with her older sister, Venus.
Williams said that despite the physical stresses from having a baby, she was in a far better place mentally than she'd ever been throughout her career. "I want to teach her that there are no limits". "Now that I'm 36 and I look at my baby, I remember that this was also one of my goals when I was little, before tennis took over, when I was still kind of a normal girl who played with dolls". Solemn. It breaks my heart.
Williams told the magazine that the first couple of months of motherhood have tested her in ways she never imagined.
"I think that's when the turning point came in our rivalry, when I stopped looking at her", she said.