How do you find a copy of a prior will that has been revoked just before the death of the testator?

It may be difficult for you to obtain a copy of a revoked will. At the link provided below there is some Excellent advice regarding where to look for a lost will. If you have access to the home of the decedent the checklist might help you to make a search for a copy of the prior will. You might ask the family lawyer for any wills she may have in her files although she may not share them with you. If you suspect the new will to be invalid you would need to make your objections to the court and state your reasons for objecting. Perhaps your own attorney could request a copy of any former will as part of a court action.