Hi, I know this thread is a few weeks old but it may help.
My wife is 5'2" and at the end of last year, after searching for months for a suitable bike, we bought a XS Moustache Samedi Open for her. It was the only bike she could ride because she has a little difficulty with raising her knee over the top bar of a 'normal' bike and the same with the trapeze frames that many manufacturers offer.
These trapeze frames are usually 55cm at their lowest point but increase height rapidly to join the handlebars. To get your leg over the topbar is not as easy as you'd think - you'd need to be able to move your knee up to 80-90cm so that your foot can clear the topbar and that just wasn't a reliably attainable option for my wife - some days her sciatica would just not allow this even though the act of cycling itself would reduce her hip pain!
The Moustache bike was a game changer and she absolutely loves it as she can simply step into it.
A couple of days ago I bought her a Cube Kathmandu EXC Easy Entry as she needed a more powerful motor (we live in a very hilly area):
Kathmandu Easy Entry Xsmall
I was extremely lucky to have found this bike for her - I must have called every Cube dealer in the UK and got given pretty much the same answer "Maybe at the end of the year".
We're going to be selling the Moustache in the next couple of weeks so something like this may be an option for you if you can find one near where you are but I'd recommend calling each dealer and asking if they have anything that's not on their websites. Some do as they are too busy selling bike to update their own!