Where does it say this in the Bible?
she has not been resurrected like Christ
Nobody has EVER suggested that she was resurrected.
it is completely improper/sinful to communicate with her.
Can you cite a single verse in the New Testament that supports this? Revelation 5:8 specifically REFUTES it.
Notice the important clause "on earth." The people who pray together must be "on earth." This definitely rules out those who have left this earth.
When Jesus taught the disciples to pray, He never encourages the disciples to ask Abraham or Moses or Noah to pray for them. Asking the deceased to pray for us is unheard of in the Bible, and contradicts the teaching of the Bible."
In Rev 5:8 since WE are the saints whose prayers are mentioned this in no way supports praying to those who have passed on.
2 Corinthians 13:13
All the saints send their greetings.
Ephesians 1:1
Paul, an apostle of Christ Jesus by the will of God, To the saints in Ephesus, the faithful in Christ Jesus