Or, more optimistically: “keep trying; don’t ever quit; be relentless; you haven’t failed until you give up”.
You could also use Einstein’s definition of insanity, keep repeating the same actions over and over again and expecting a different outcome
She’s like a fictional boxer who is 0-7 and been knocked out 7 times and keeps coming back only to get knocked out again
It might be time to use a different strategy since what you are doing isn’t working