Well, gosh, Ms. Terry. I'm not sure who "she" is, that you're referring to. And there is no such thing as "YOUR truth". Are you asking about my opinion? Or did you mean to ask about "THE truth"? Anyway, to answer your question:
"You were the model of perfection, full of wisdom and perfect in beauty (see What Does Satan Look Like?). You were in Eden, the garden of God; every precious stone adorned you: ruby, topaz and emerald, chrysolite, onyx and jasper, sapphire, turquoise and beryl. Your settings and mountings were made of gold; on the day you were created they were prepared. You were anointed as a guardian cherub, for so I ordained you. You were on the Holy Mount of God; you walked among the firey stones. You were blameless in your ways from the day you were created till wickedness was found in you." (Ezekiel 28:12-15)
The horrendously wicked spirit-being that we now know as Satan has not always existed. He was created by God, not as the evil loser (see The Lame Duck) that he is now, but as the above Scripture describes, created perfect in wisdom and beauty. Satan was, at a time long ago, perfectly righteous and obedient before God. Put another way, at one time, Satan could have been one of the best friends that any Christian could have!
But Satan went bad, very bad -
"How you have fallen from heaven, O morning star, son of the dawn! [or Lucifer, which means light-bringer] You have been cast down to the earth, you who once laid low the nations! You said in your heart, "I will ascend to heaven; I will raise my throne above the stars of God; I will sit enthroned on the mount of assembly, on the utmost heights of the sacred mountain. I will ascend above the tops of the clouds; I will make myself like The Most High." (Isaiah 14:12-14)
Satan didn't just refuse to obey God any longer, which was bad enough; he actually tried to overthrow God! The attempted coup failed of course, as described by Jesus Christ: "I saw Satan fall like lightning from heaven." (Luke 10:18) (see A Picture O Heaven). This would have occurred long before His birth in Bethlehem as a human (see Rock Of Ages). Satan was still on earth during the time of Jesus' ministry (see Go Ahead, Jump! and That Old Serpent), and was directly involved in His betrayal by Judas Iscariot (see Why Did He Do It?).
God created the perfectly-righteous Lucifer, by God's choice. Lucifer created the absolutely-wicked Satan, by Lucifer's choice. Lucifer, and all of the millions of angels had the power of choice - to obey, or to rebel. Most chose to obey God, while some followed Satan's rebellion and have become hopelessly corrupt (see Could Satan Repent?).
Click any of those links to see where I got that explanation, Ms. Terry. I used a website called "Google", a funny name, I know, but it will find just about any information you'd ever want to know! For future reference, anyway.