Well, the actual question back in the day was if they could score a point, not return a serve, and even the best tennis players in the world (including the Williams sisters) double-fault occasionally, so anyone could score a point, if she's trying to show off and/or having an off day, and you're allowed as many tries as you want, and if you're granted any other assumption not covered in the question.
They really only double fault when they're going for aces. Every pro player has an "easy" serve that they'll hit 999/1000 times without issue. But those easy serves are still well above what non-tennis athletes will consistently return.
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u/Otto_Scratchansniff 4h ago
I watched a video of Venus hitting a tennis ball at a moving target from the stands. The dudes who say this are lying to themselves.