I requirement some backing near the child I'm babysitting. More info inside?

I am babysitting my roommate's daughter and he had told me that she has a mental development problem, but didn't specify which.
Her manner sometimes worries me.
She only likes to draw (No problem with that), or view movies. I try to get her to add, subtract, write and spell words, which she does but she sometimes doesn't handle the concept.
One year I gave her some cereal, she tasted it, and almost cried because she didn't like it.
And most of the times, she go to the couch , leans over the armrest and stands on her head.
She also needs a long time to judge about what she says.

would this be pdd-nos?
(pervasive developmental disorder - not otherwise specified)

Again, I have no problems next to her and i realize that children like this need special attention and all of that. I am merely really puzzled.
Answers:    I'm a nanny .that's normal things that kids do but she might just have join. you know she is special so just take things slower. As far as school work I don`t know you find out the method her school teacher takes so she would be smaller number confused.
why don't you just ask your roomate? :s
i wouldn't worry too much about it, i propose if they don't know what she has..then the parents should be going to the doctor..
make sure you offer her lots of attention and fun..she is a kid remember :)

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