$300 is premium price for that bike. I bet it needs more than what's listed there. On the other hand, just the 8-speed rear wheel and the shifter for it would run close to $300 by themselves. An internally geared hub like that is very easy to live with (until you have to fix a flat tire, anyway). Because of the special wheel in the back, the hub motor wheel should go in front.
The bike has 700c wheels and only enough room for skinny tires. That's good for keeping the weight down and for having a wide selection of fast tires, but bad for ride quality on rough streets, and vulnerable to punctures and tire damage. Most places outside of NOLA, I'd say no problem. But there, it's an issue.
It's easy enough to find 700c hub motor wheels, and front wheel kits are pretty easy to install. On the downside, there is no particularly good place to put a battery on that bike.
If she must have a folder, that's a pretty good choice. A 26" model that accepts fat tires would be better. But using a folder will make e-bike conversion significantly more complicated in terms of mounting the battery and other necessary parts.
In my observation, people who ride full-sized folding bikes only fold them to carry them in car trunks-- and people who ride e-bikes generally don't put them inside cars at all, because e-bikes are heavier and more susceptible to damage than pedal bikes.
