As she, in my opinion, was still a child at the time of her marriage, it does not surprise me she felt that way. However, we should not forget that it happened in a different time, with different rules. Women were not seen by the majority of men as they are looked upon nowadays.
Also, she was way in over her head! She could not back out as soon as it was announced. It must have all seemed so romantic to her in her childish mind and to be confronted by the cold hard truth of the physical part of marriage, it does not surprise me she felt raped. She was there to provide an heir, I believe she knew this. In turn she was given status, that's how it works. In most Royal families these arranged marriages were commom place, after the first of the 'new' had worn off, men went back to their mistresses and the wife was left to her own.
I think we, as a society, should not look upon their lives with 21st. Century eyes. Don't forget, women were only 2nd. rate creatures. There to please, show off and be a broodmare.