The 26-year-old, along with Gabby White, had her sights firmly set on becoming the first pair to win the women's doubles title for a fourth successive time when it kicks off in Manchester on Friday.
However Wallwork and White no longer play together following changes made by GB Badminton and instead will compete against each other with Alex Langley and Lauren Smith respectively.
Both partnerships are still new, and Wallwork has been battling injury but, as a three-time women's doubles and two-time mixed doubles winner, she's still determined to leave victorious.
"Gabby and I got split up a few months ago. We were not very happy with it and we did want to play together and retain the title," said Wallwork.
"But the guys at the national centre wanted to mix things up and get the level of everyone better so we have two new partners.
"It's quite difficult. For Nationals we have always loved playing in them and we were looking forward to another chance to defend the title.
"Nobody has ever managed to win it four years running so we were planning on getting that record but we will all have the same mentality to go and win it.
"It is going to be difficult to win it this year because all the pairs are fully level and we have had not the best of starts because of my injury but I hope we can do well."
Wallwork had hoped to compete in the mixed doubles with Andrew Ellis as well as the women's with Langley in Manchester however he has had to pull out through injury.
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- Alex Langley