Well...if she is allowing him to mate with her, then you're going to need to set up an egg box for her to lay in, and soon. She will lay eggs, even if they aren't fertile.
Now, people have kept WDs and Basks together in the past, and no one has EVER reported a successful hybridization.
But since someone started crossing kings and corns, and now someone else just hatched a woma/carpet python, you might as well go ahead and incubate the eggs...and see what happens.
Because it's become clear that when it comes to reptiles...you never know.
Step up the calcium, and feed, feed, feed--you want to get more weight on her, if she wasn't well a short while back. She'll slow down and may even stop eating as she gets close to laying, as the eggs will put pressure on her stomach.