Google Images furnished nothing.
Where was this photo taken from ?
Can I access by private sedan where this girl is standing? Any hiking required?
I found a geotagged picture from the same point of view on Flickr.
It is a panorama over Seton lake near the town you mention, Lillooet, in British Columbia, Canada.
The point of view does not seem to have any path or road to access it directly. I could find it marked on OpenStreetMap. It is located close to Highway 99 between Whistler and Lillooet. There is a parking spot (categorised as pulloff so I expect it is very small) in the previous turn and then it is possible to walk along the highway for 100 metres and then climb in the bush for another 100 metres to the view point. When you switch to a view of the map with contour lines, the elevation does not seem that big, so I assume that with sport shoes and the will to climb in the bush, you can get to that point of view.
That bend in the road is pretty apparent on a map. It appears to be Highway 99 about 5 km west of Lillooet.
Highway 99 is on Street View, and from the part of the road closest to the river, you can see the mountain on the other side with the distinctive slide.
You can drive on Highway 99, of course, and you can see there's also a dirt road on the south side of the ridge, but either way you'd have to hike up to the top of the ridge.