Anybody who has ever done a crossword puzzle should not find this particularly impressive. When I'm watching "Wheel" regularly, which is all the time because it is the best, I will have a moment like this at least once a week. There's more to solving puzzles than the letters! Consider:
The apostrophe means that "_'__" can only be "I'VE" or "I'LL", and when she guessed L, she was able to narrow down the word.
A single letter by itself is either an I or an A, and because we know the first word is "I've", we should now know that this blank by itself is likely an A.
So while the ignorant among you read the puzzle as "_'__ ___ _ ____ ___L___ _____ ____", the expert player read "I'VE ___ A ____ ___L___ ____ ____". A good solve, to be sure, but not so stunning as you are all making it out to be.
Well, if its not so impressive, then why is she my perfect mate? Because she realized the value of the prize puzzle! She knew that by risking further spins, she was gambling not just with the $900 she had won, but actually with closer to $6,000 based on the average value of a prize puzzle. While my preferred move would have been to spin once more and guess "G" because there were three G's left (this had a higher expected value than simply solving), what she lost in monetary value she made up for in totally fucking badassery. Which you simply can't put a price on.