Her stunning rise to world fame has seen news reports saying that she's likely to make £100 million of more in sponsorship deals - which will of course also be accompanies by, in all likelihood, significant tournament winnings (case in point, she pocketed $2,500,000 from her US Open success). Her connections to China too and ability to speak Mandarin (she has a Romanian father and Chinese mother) will no doubt bring more fans and sponsorship opportunities in that part of the world also.
Now 23rd in the tennis world rankings (and the British number one), the 18 year old was ranked 150 prior to the US Open and had little in the way of tournament experience. At the start of the year she was ranked 345, which just goes to show how fast her ascent to greatness in the sport has been. For this reason alone it's not surprising that she was a huge outsider to win the US Open, available at 499-1 with bookmakers (and of course bigger on platforms like Betfair). She was similarly priced to win the BBC Sports Personality of the Year but is now favourite to win that accolade, currently at odds of 1/10. The only way is up for this emerging talent!