75 yards sounds like a far distance, but when you put it into perspective it really isn't. Consider many non-athletic men can run a hundred yards in say 12 seconds so they can do 75 in nine seconds. A deer is much faster so it probably only took her 6 seconds or less to cover that distance.
When the adrenaline kicks in they are super boosted and don't really know they are dead. Good job.
When placing a trail camera don't just look for a well used trail. What you want to do is look for a freshly used trail off by itself that goes from a north facing ridge, thick forest, brushy knob or some other similar bedding area to a food source. Don't forget water sources. Especially in the summer months the deer need water so look for a good trail going down too a creek surrounded by thick cover and place the camera 100 yards up from the water source.
Scent control is very important...