Climbing at high assistance levels kills batteries very quickly.
I've done 100+km with 1300m of climbing with variable assistance levels, none to max, and used 75% of the battery.
I've done 20km with 700m of climbing and used the same amount.
I'm 116kg currently and can ride over the cut off point on the flat, up 1-2% and short 3% grades. This helps keep the battery usage down.
I have a Cube Agree Hybrid SL with the Fazua system, same as the Pinarello. It just works and is quite light relatively speaking.
Several manufacturers use the system including Boardman and I've seen bikes as low as £1500 using it, can't remember if they were on offer though.
You pays ya money to take your choice. I would definitely try several before you buy though. Heavy bikes are no fun and can feel dead when riding.
My Cube e-bike and GT Grade Gravel bike are two totally different beasts when ridden. Even with the assistance the Cube can feel sluggish up hills even though it's quicker than the 5kg lighter GT.
Choose the bike most suitable to your riding.
I love my e-bike it has dug me out of many holes.
I hope your wife finds hers