late 70's early 80's movie about a witch

[ct]

been trying to find a movie I saw when I was young.  A girl went to stay with her cousin I believe.  She did weird things like made spots or her in a picture.  But a one point she attacked her in a dark room while she was developing film.  Her eyes turned red and she was a witch.  I think she chased her cousin and boyfriend in a car at the end but ended up crashing and dying I think.  I have looking for this movie for years I sure its stupid now but it scared the crap out of me when I was young.  If anyone can help I would apprecite it.

[Psycho Circus]

This could possibly be Wes Craven's 1978 TV movie called "Stranger In Our House".

A young girl's cousin goes to stay at her house and suspects her of being a witch. Her suspicions turn out to be true.

http://www.imdb.com/title/tt0078330/

It also goes by the name of "Summer Of Fear", it stars Linda Blair.


Another possibility might be "Sarah's Initiation" but it's a bit more like a "Carrie" rip-off.