I think differently than others..
No personally I don't think your being too demanding... me and my boyfriend are in a long distance relationship from going out for almost 2 years... and he asks what I did and where I was and all that stuff all the time.. im perfectly fine with it... if you thinking she's sleeping around on you and you have a comment like that then can understand why she would be upset but otherwise I don't think your too demanding at all.
Your are not demanding...
I would love if my man would ask me to where I am, what I am doing, it just feels like he is so concern about me... its like you love the person you want to know how the person is... and I know how it feels when that person is not responding well about that but as you said it has just been lately then maybe she is busy with something... work maybe or schooling that is occupying her much but still then what is 10 minutes of call to say how you are... give time maybe in a while it will al be back to normal but then keep on checking on her.