So that's a rise of about 425' over the span of a mile.

If your partner wants to not pedal up the incline, then she's going to need a substantial motor, and it needs to go on the rear wheel. The bike you picked out has a motor that isn't strong enough to do that incline without her help. If you are in the US, you can buy a 750W rear hub motor with a throttle (or button) that should suit her needs nicely, run up the hill unaided by pedaling, AND is the legal maximum wattage motor allowed for US pubic on-street use. But I think you are outside the US, so you need to check what the maximum wattage you will be allowed to have on a street-legal ebike for your county, and then get that maximum watt hub motor.

Have her try out and select a nice steel woman's hybrid that she feels most comfortable riding, and buy the rear ehub wheel kit for it. Put the two together, and she'll have the bike she likes, and the ehub wheel that will do the job she wants - whether she pedals or not. She'll really enjoy it.

JMHO