i have to admit, this sounded like a completely insane idea when i read the first post.
But - the more i dig into it the more i find those who've done it. So - not so insane after all it would seem.
I can't see the 'video cam' system working well for a few reasons. But the laser sight idea seems to be working already. My advice is always go with what others have found works.
If it were me - i'd do something like this:
Step one - get some high quality hearing enhancers with directional capability. That means seperate mics for each ear and/or the ability to attach one of those small parabolic directional mics. That would give a person the ability to 'look' for deer along with their spotter. By being able to be an active participant in the process of identifying the animal you bring them more into the 'hunt'. There are some excellent high end products out there at reasonable prices - and i'd bet good money that someone with a fine ear would quickly be able to distinguish between all kinds of animals long before they come into visual range - as well as being able to tell if there's more than one. That makes them actually an asset to the hunt, able to pick up and give info on animals before you can see them. I've spent time with action ears on in the woods - and it's pretty damn cool. My poor brother on the other hand was wearing them when a squirrel snuck up behind him and started chattering - sounded like a tyranosaurus he said.

We threw THOSE undies away.
Also - tracking the animal by sound will likely give a good sense of direction and range making it easier to get in the ballpark when the gun comes up. Less effort and noise getting 'close' to the animal.
Step two - you have to have a system of aiming that gets her near onto the target. I would think that perhaps a stick or other device that allowed you to sit behind her and point at the animal with the stick touching her - perhaps across the shoulder or something. She lines up her gun in line with the 'feel' of the stick and i bet if you practiced you could put her on target at 50 yards every time.
Alternately, you could put her gun on some sort of swivel - maybe a portable shooting table or something. Something so that you could swing the gun onto the target for her and get it lined up enough so that when she hits the laser it's very close to on target.
Step three - the laser sight. She activates it and you correct her aim. With luck and practice, it'll need only a minor correction to be on target. There are DEFINITELY lasers that are visible and sufficient out to 100 yards. Call texas's Conservation Officers and ask what they're using down there.
In bc you would need special permission to use the laser i think. But maybe not in your province.
You'd really have to pick your place - somewhere that you could get the deer close (i think realistically you'd want to keep it within 50 - 60 yards, especially the first time) and you'd want to be ready to back her up in a heartbeat if the animal doesn't stay down.
If she REALLY wants the full effect - she can help find the animal after the shot with one of those infrared animal trackers. I've got one, they actually do work and they have an ear bud for audio tracking (which i find works best.) Again -takes practice but you can track a down deer with it pretty darn good.
