Hi Jolie - when people die their spirits go to Sheol (the grave). It is impossible for them to cross over (unless God allows it as in the case of the witch of Endor - 1 Samuel 28 - the only case recorded in the Bible).
There are no such things as 'ghosts'.
What you saw was a demon, parading as a 'ghost'. Some people have the ability to see into the spiritual realm - I myself have seen demons (and smell, feel and hear them), but when I became a Christian I asked God not to show them to me unless absolutely necessary, and He has answered my prayer.
Hope this answers your question.
God bless.
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"for in Him we live and move and have our being."Acts 17:28
1 Cor. 2:10 "but God has revealed it to us by his Spirit. The Spirit searches all things, even the deep things of God." (NIV).
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