I really wished I didn't pass this by.
This is just one of the manty unproven stories that is circulating the net. I am not an Atheist saying this but a believer in Christ.
As it is, this story has a number of tremendous theological problems.
1st, Jesus never visits anyone unless He personally chooses those to be His Apostles (1 Corinthians 9:1-2).
2nd, Jesus does not come until the Second Advent.
3rd, there are alleged visitations of not just Jesus but the angels who simply appear but bear no meaningful instructions when in the Bible, whenever there is a theophany (God appearing), or an angelic appearance, they have a message of instruction and much of it has to do with salvation.
Here in this story, Jesus only told the little girl "Everything is going to be OK". Nothing about her to believe Him alone for salvation, and not even to direct her to the right church so she can hear the correct gospel.
Instead, you have a teacher, (likely a Catholic who holds a different gospel - Galatians 1:9) telling her that Jesus never left the cross. Even the Catholics will deny that because by that answer, it denies the resurrection of Christ.
If it actually happened, then whatever that visited the little girl is not Jesus for the aforementioned reasons (2 Corinthians 11:13-15).