It doesn’t really make her that much more vulnerable, and it still keeps her one-shot on her primary fire with 0 cost or counterplay (the laser really doesn’t do much for counterplay as good Widows already don’t hardscope much and the laser can be easilly hidden)
The actual solution to the problem is to add a cost and counterplay to her one-shot, which would look a little something like this :
These changes would ideally be paired with a slight fire rate nerf to Ashe.