she said she wanted to make friends with someboy whose education is higher than her.and christians in church are also very honest and good persons. in fact i am a busier person. i can be her friend ,but i don't want to waste time on her.
Showing love towards one another is never a waste of time.
Do not expect immediate results. Some sow the seeds, others may water the seeds...and God causes the increase in His time.
Your friendship could be one of the many "Hallmark" movies in Heaven in how Jesus saved your "friend". She is obviously attracted to Christ in you in seeing the good in you. You need the fruits of the Spirit of patience, longsuffering, and love to help you through your special time with your friend.
Just tell her that if there is any a time where she does not believe she is good and that even hanging around good people does not help her to be good, then tell her that is why you are good because of Jesus Christ in you, and that God will save her from her sins that are bothering her and help keep her from her sins.... if that be the case for why she wants to hang around good people.
It is possible that she seeks to educate herself but God may give her wisdom and the Father may reveal His Son to her ( see Matthew 11:25-30 )
You can also tell her that after having been saved by Jesus Christ, she can be with the good God all the time because Jesus Christ will be in her ( 2 Corinthians 13:5 ). She may find that after having been saved by Jesus Christ, she will have the Best Friend she could ever have in this world and He will never leave her to help her face bad times as well as help her through it.
Since she wants to study the Bible with you...go over the promises of Jesus Christ like how He comes to destroy the works of the devil in our lives so that sin will not have dominion over us & not just give eternal life. ( 1 John 3:3,8 & 2 Timothy 4:18 ) It is about living a reconciled relationship with God through Jesus Christ Our Good Shepherd as well as our Saviour so that our lives will be fruitful and our joy may be full.