The blood of Christ, while it was to release the repentant sinner from the condemnation of the law, was not to cancel the sin; it would stand on record in the sanctuary until the final atonement. Ellen G. White 1890, Patriarchs and Prophets, p.357.
At the time appointed for the judgment - the close of the 2300 days, in 1844 - began the work of investigation and blotting out of sins. Ellen G. White 1888, Great Controversy, p.486.
According to E.G. White, repentance of sins does not free you from them, instead they are just moved to another book for judgment until your life ends; there is no assurance of salvation.
However, the Scripture plainly teaches that you are saved the moment you repent of your sins and place your faith in the atoning sacrifice of Jesus. The sins are forgiven by Him and not held against you later.
I would suggest Seventh-day Adventists review what the Bible says about this in the following passages:
Hebrews 8:12; 13:12
1 John 1:7,9; 2:2; 4:10
Ellen White plainly contradicted Scripture and was a false prophet.