But Williams, whose triumph in Melbourne past year gave her an Open-era record 23rd grand slam - one shy of the all-time record held by Australian Margaret Court - still has a desire to compete in tennis's blue riband events.
"We'll wait and see how tomorrow goes and then we'll make our adjustments, if any", Rinaldi said.
"It's probably been the most fun of my life", she said.
The sisters were attending a team dinner ahead of the U.S. Fed Cup tie against The Netherlands in Asheville, N.C. But it also showed tennis fans that the 23-time major victor still had a long way to go, enough so that it prevented her from defending her title in Melbourne.
"I don't know", Williams told reporters. "I just had some bad luck, I played players who just were on fire", she said. "But she's definitely remained just very youthful and childlike at heart".
But this weekend's headline is the return of Serena Serena, who participated in a Dec.30 exhibition match but otherwise hasn't played since that 2017 Australian Open.
Instead, she will get her first taste of competitive tennis when the United States kick off the defence of their Fed Cup crown against the Netherlands on the indoor hard court at Asheville, North Carolina.
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"She enjoys Fed Cup, and Serena and Venus have been extremely supportive, and it happened to be a good fit".
Williams, who married Reddit co-founder Alexis Ohanian in November, said being a mother may boost her quest, believing that it has given her a more relaxed perspective on her profession. "I love motherhood, and I look forward to just being the best mom I can be". So the fact she's here representing the U.S.in Fed Cup for the first time since 2015 is commendable.
"She's been really, really positive", Williams said. "You have to get used to that, get in the rhythm of that".
In the other Fed Cup first-round ties this weekend, Belarus plays host to Germany in Minsk, Switzerland opposes the Czech Republic in Prague, and Belgium visits France in La Roche-sur-Yon. "The thing about Serena is she's never going to come back unless she feels she's where she wants to be tennis-wise, physically and mentally".
The rest of Friday's press conference focused not only on Serena's comeback but on her new journey into motherhood.
She received a big ovation during team introductions and sat on court with her teammates during Venus's match. "I think sometimes motherhood changes people in a way that they become less young and more serious, but that hasn't affected her".