She’ll retire when she can no longer convince WTA tournaments to give her wildcards - for now, she’s still finding some success in that department (basically all her 2020 points are from the Auckland WC, without these she’d already have fallen to around 500, and she had another WC secured to the Thailand Open that she’s now missing out on due to injury)
Her comments a year ago about wanting to go down to lower level tournaments and build confidence show how fake she is - she knows she cannot grind her way back into the top 100 with low level tournies, as her game is far too inconsistent to win match after match week after week against hungry upstarts and veterans looking to keep careers alive - instead her team begs for WCs every week of the year, which is fine, just be honest about that strategy - she wants handouts to tournies with Moet champagne tents, and has no interest in playing the tournaments her ranking actually qualifies her for