有一位个女生，她已经迟到了。

There was a girl who was already late. So, she was walking very fast. While walking, she saw a dog about to cross the road. When the dog was crossing the road, a car hit the dog. Before the hit, the girl was not walking very fast, so the dog did not hit her. Although the dog got up immediately after being hit, the girl knew that the hit would affect the dog. She did not know whether it was a big or small impact.

在走步路的时候，看到一只狗要超过了公横穿马路。

超过狗过马路的时候，一辆车就打击那只狗撞到了它。

打击前，女生没走得很快，所以狗没有打击她被撞到她身上。

虽然狗被打击，撞，但它马上站起来了。

但那个女生知道那个打撞击会影响那只狗。

是不是大或者至于是大还是小的影响，她不知道。

在走步路的时候，看到前面的一只狗要超过了公跑上了马路。

Without the 前面的 it sounds like the girl could be going in a different direction comparing to the dog. I was a bit confused, but it could be just me.

超过马路的时候，一辆车就打击撞到了那只狗。

打击撞到狗之前，女生没走得没很快，所以狗没有打击撞到她。

Even in English this doesn’t make much sense. Why would the dog be hitting her? Wouldn’t it be the car? Or do we mean like, car hit dog, dog goes flying, dog hit her?

虽然狗被打击，狗被撞到以后，虽然它马上起来。了，

Your original sentence means “although the dog has been hit, it got up immediately.”Grammatically correct but means something different.

但那个女生知道那个打击会影响那只狗被撞到会对那只狗的健康有影响。

Just 影响 sounds a bit too vague. The grammar was ok though, besides the 打击.

是不是大或者小的影响影响或大或小，具体的她不知道。

所以她走得很快。

在走步路的时候，看到一只狗要超过跑上了公路。

超过穿过公路的时候，一辆车就打击撞到了那只狗。

打击碰撞发生前，女生没有走得很快，所以狗没有打击撞到她。

虽然狗被打击，撞到了，但它马上就起来了。

但那个女生知道那个打次撞击会影响那只狗。

是不是大或者小的影响大小她不知道。