I have to give your wife the nod on this one--with one correction.
Jesus did appear in the flesh after his resurrection. In Luke 24:39, He told His disciples when He appeared to them after His resurrection, "Behold my hands and my feet, that it is I myself: handle me, and see; for a spirit hath not flesh and bones, as ye see me have." He specifically states that He was made of flesh and bones and not just a spirit. In another post-resurrection appearance, Jesus ate bread and fish with the disciples (John 21:12-13). These were not the actions of a spirit.
However, we need to remember that this body was a resurrected body--like the body we will have when we are resurrected. This body is also called a glorified body. The glorified body does not have the limitations of our present body. Jesus appeared in rooms where the doors had been shut and certainly locked: "Then the same day at evening, being the first day of the week, when the doors were shut where the disciples were assembled for fear of the Jews, came Jesus and stood in the midst, and saith unto them, Peace be unto you" (John 20:19). Christ never passed through closed doors during His earthly ministry; only after His resurrection.
1 Corinthians 15:44 speaks of our death and resurrection: "It is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body. " The spiritual body is what I earlier called the glorified body. It is the body of the saints when it has been resurrected. It is an incorrupt body, but it is a body.
Now, the one correction. The amount of time Jesus spent on earth after His resurrection and before His ascension into heaven was 40 days. Of this time, Acts 1:3 states, "To whom also he shewed himself alive after his passion by many infallible proofs, being seen of them forty days, and
speaking of the things pertaining to the kingdom of God." We are clearly told that He appeared for forty days on earth. Also, He ascended before the feast of Pentecost which occurred exactly fifty days after the feast of firstfruits, a feast that coincided with His resurrection. That means that the believers prayed for ten days before the day of Pentecost for
the coming of the promise of the Father.