The 23-time Grand Slam singles champion will return to the WTA Tour at Indian Wells in California this week.
In an interview with BBC Sport, the 36-year-old American said she is motivated by the thought of playing long enough for her six-month-old daughter to have memories of watching her.
"It's been hard," she said.
"There have been so many days, even still, when I'm like, 'how am I going to keep going?'
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