Let me say I know little to nothing about mollies.
I did want to mention though that a 23" draw is more typical for someone of 4'10" than 5'3". Her draw should be more like 25" if she has normal limb proportion I would think.
My point is I would build the bow for the greater of the two draw lengths unless you're absolutely sure about the 23". Also people's draw length, especially with trad bows, sometimes increases as they shoot more, develop form and also build strength. So if she's not done a lot of shooting, it may increase.
Couple extra inches of bow may save you trouble later, that's all.