She is 5'8", 30" inseam and we lowered her NC700x (but not quite enough).
She can NOT flat foot the bike and she DOES have trouble moving it unpowered on any sort of a slope, such as in a driveway, because she does feel off balance since she can't flat foot the bike. She is always worried about a tip over at 'unpowered' speeds because she has to rely on 1 foot for balance. She felt far more confident on a HD "Street", which is one of the smaller HD models, simply because she could flat foot that bike.
I will be lowering the bike a bit more this week to help her out with the flat foot issue.
Now all that said, once the bike is rolling she is totally fine with the weight. Coming to a stop, riding in traffic, etc is not an issue for her. But oddly sloped parking lots, sloped driveways, etc are always a bit of an issue and that issue is because she cannot flat foot the bike with both feet.
As it is, one foot is flat, the other is on her toes. My goal is to get it down as low as I can get it for her so she can flat foot.