Gotcha, well that was a dead end. Any brands that are comparable in price that have 16 channels, come with eight cameras and is a dvr system?
You have been given some good examples at the beginning of this thread.
This isn't going to be a simple afternoon install.
Stick with Hikvision or Dahua equipment.
Do not purchase the equipment from amazon or flea bay, as the chances of them being hacked Chinese region cams is high from those sources.
Use Ethernet cable where possible.
Where you can't, use the Ubiquity equipment mentioned above.
You want it to be reliable for her correct? Does no good to spend all that time and money if it isn't reliable or she gets frustrated with it.
Buy once, cry once.
Do it in stages if you must, purchase an NVR, and a couple of cams and get those setup and going. Then expand as time and funds permit.
The NVR a lot of folks here are using and happy with is the
Dahua NVR5216-4KS2 NVR5208/5216/5232-4KS2 | Dahua Technology
Then look at the Starlight Dahua cameras on that same site.
Here is two examples: Dahua Starlight IPC-HDW5231R-ZE 800 meter capable ePOE
All of this can be purchased through Andy mentioned above.