No doubt your friend is sincere in her concern for your salvation, and you should let her know you appreciate her concern. I wish more Christians were as concerned about the eternal destiny of those around them.
However, your friend has missed one of the Bible's greatest truths, and I hope someday she'll come to understand it. It is this: Our salvation depends solely on Christ, and what He has done for us through His death on the cross and His resurrection from the dead. No matter how good we are ... no matter how loyal we are to our church ... these will not save us. Only Christ saves us, as we put our faith and trust in Him.
Jesus Christ was the sinless Son of God - but when He went to the cross all our sins were transferred to Him, and He took upon Himself the judgment we deserve. Now He offers us forgiveness - freely and fully - if we commit our lives to Him and trust Him for our salvation. The Bible says, "Therefore, since we have been justified through faith, we have peace with God through our Lord Jesus Christ" (Romans 5:1).
Ask God to help you share this great truth with your friend - not arguing with her, but simply pointing her to Christ. Then rejoice that someday you will be united in heaven with all who have trusted Christ for their salvation.