There are many methods you can use to try and attract your ball to the rodent,
when your thawing/defrosting the rodent place it on a plate in the room where the ball is kept at let it thaw till room temperature... then get a hair/blow dryer and blow dry the scent of the rodent towards the balls cage till the rodents head is quite warm/hot
Then dangle the rodent down from above "zombie dance" if the ball takes no notice and goes into his hide then i would just throw the rodent away then try feeding him on the next scheduled feeding day
Hope this helps.