Why are there no REAL good pics of her?

The reason for that is simply
because she doesn't want to be seen.So she'll keep out of cameras
way. She wants her existence to be a mystery, and no real proof on her cursing the woods and why people shouldn't go there, so she'll have more victims...

Why is she cursing the village/town?

She wants to get revenge on the town, for them accusing her and killing her.

What happened to the three students that went into the woods? Why did they go there?

The students where doing a project on her called "The Blair Witch Project". They got frighingly lost in the middle of the cursed woods. Where they got taunted by Elly the witch, and they heard sounds in the dead of night till the sun came up. Soon, one went missing. In panic, the other two heard him screaming, they followed the screams and came to a house where the witch lived years ago... still does. They went in and searched the house, in the end, went to the basment and saw him standing in the corner dead still

The witch had full power over them, he was standing in the corner because the witch stunned him to do it (some kind of trance) while she took care of his friends.

Forgive me for asking but... how does she kill them after all the frighting?

She stunns one or two to stand in the corner (depending how many people there are) while she kills one, pulling out their organs while they're alive, eating them and stamping a sign on the victims forehead

She did this, and does it today, she'll never stop.