You're receiving some great advice on here from people who have gone through a lot. Are you yourself familiar with the Bible? The witnesses are very good at cherry picking scriptures to suit their doctrine of the moment. I will repeat what others have said and ask you to go to jwfacts.com. there is a wealth of information there. Use it SLOWLY in the form of asking questions as one eyejoe & jhine have suggested.
Your friend is definately being love bombed, told that satan is using you to try and stop her study( "your friend means well, but doesn't have "the truth" as we do, satan is using him/her"). They will use cherry picked scriptures to try and show her they are right, the "true" religion, etc. Do you know exactly what they have taught your friend yet? If you do, maybe you could work on disproving some of that through the Bible first? Do your homework, know what you're talking about. Use jwfacts as well as other reputable sources.
Do you know a pastor who is well versed in scripture who would be willing to sit down with both of you and go over some of the things they have told her, and discuss the scriptures involved? That may hold some weight.
The fact that she is puling away is concerning. I hate to admit it, but I did that with the urging of the witnesses who would come to my home to study. I wish the resources that are available today were then, and that someone had used them to stop me. But the witnesses are taught how to be manipulative and kind of bullies, for lack of a better word. If she enjoys their company and the compliments they are no doubt giving her , they may threaten to stop coming if she questions them, telling her they aren't going to waste their time if she just wants to argue. Presenting them with facts that contradict what they are telling her is not considered discussion, it is considered arguing. Can you organize some social things to fill some time? Just a suggestion.
You're going to get much good, sound advice on here from some who have been through the mill! You might want to read some of their stories. All the best to you as you try to help your friend! Remember to never be confrontational.