When to worry about obsessions?

My daughter has high-functioning autism.  She is overly obsessed with death even though I explain to her in detail about her concerns when it comes to this.  One of her worries is her thinking she is going to die.  She takes everything literally so we have to be careful what we say or what she watches on T.V.  I just wonder if this is something I should worry about or not?  Some of the things she says or draws really do worry me.  She will talk about this subject in detail and will not stop unless you make her.  Is this normal for an autistic child to worry and obsess so much about death?

On a good note, another thing she obsesses about is T.V. ratings.  Whether that be T.V. programs, movies, news, etc.  That's right I said the news.  She just has to know what anything you watch is rated.  Her favorite rating is PG-13 and T.V.-14.  Her dream is to one day move to Hollywood and be in a PG-13 movie.  Of course, when she turns eighteen.

I wonder if this is a form of OCD also?  It doesn't sound like it to me, but couldn't it be part of the anxiety?
We are also this month going to try to get her put on Strattera for problems with concentration and other problems at school.  I also read it is good for anxiety.  
Has anyone had any problems with this drug?  
Can anyone suggest any other medications or therapies that would be helpful?

[ceasley]

Hi. My son is autistic pdd and adhd. He is very obsessive when someone in the family is in the hospital or there is a death in the family. That is all he talks about. when my grandmother died last spring he wanted to go up and see her in her casket over and over. He takes Vyvanse for his adhd. we tried strattera but it really messed him up. he got lethargic and very confused and his doctor put him back on vyvanse. we have had the best results with that.

[ugates]

Does Vyvanse help with anxiety?  She is very quiet and still at school.  Most of the time non-verbal.  When she is at home it is the complete opposite.  Literally jumping off the walls.  She has an explosion of verbal tics and some motor tics.  She knows just enough to know that her tics looks silly to other people so she holds it in for home.  I feel so sorry for her.
I don't know if this is ADHD, more like ADD I think.  Her teachers would laugh me out of the building if I said she had ADHD.  I am so confused, just when I think I know most of everything about autism I find out that I don't know the half of it.