I would like some advice on a suitable EDC method for my better half, please?

Background:

She has a Glock 19 (amongst others) that she has become quite capable with. It is the best option at present.
After 20 years of married life, and 4 kids, she is not as slim and trim as when we got married anymore. (Mind you, I have gained about 20kg too.) She is slightly vertically challenged as well.

She has tried all my holsters in various positions.
An OWB holster in the 02.00 - 03-00 position is comfy and useable, but not concealable. Reserved for range use.
IWB at various positions does not work. The holster/gun hurts her anywhere in the front, and is very difficult to draw from 03.00 and back.
She has tried a belly band and complains about it causing heartburn. Perspiration is also an issue, especially in our hot summers.

I have suggested a change to a G43, but she does not show much entusiasm for that option yet.

Any suggestions on suitable concealed carry methods for more "mature" women would be appreciated.