@Simone20,
I don't know if she is attracted to you, if she is capable of hurting you or is just bat **** crazy. Call the choir director ask if this is normal for her. Either way, stay the hell away from her. I can't stress this enough. If I read anymore of this women's behavior I will throw up while scrubbing my skin off in the shower.
Frankly, I hope you are making this up to get a reaction from people. That would be awful of you to do. But, I still really hope you are making this up, because I can tell this is a dangerous situation, or at least unhealthy. And if I could reach thru the screen I would be waving a huge hazard sign and tell you to please for your own sake stay far away from this strange person.