The Reds were due to face the Midlands club at their Solihull ground for the second time in five days but heavy rain, since the sides met in the Continental League Cup on Wednesday night, has led to the pitch becoming waterlogged and deemed unplayable.
The league meeting was due to be the final fixture of a successful calendar year for United Women, in which promotion to the WSL was achieved in style by winning the second-tier title in the team's inaugural campaign.
Casey said:
“I'm disappointed not to end the year with a game but I’d like to thank all my players and staff for their incredible efforts this year.