Does this sound fair?

So me and my sister in law have built a cupcake business. She is planning on marrying a man from another state. So we have to go halves on everything. Our plan is well go half on the money we've made so far and from the point that she moves out well have to do it for ourselves but still use the business name.
My idea was to choose the supplies she wanted and pay the other half back such as if the flower tip was $3 shed pay me back $1.50. I still have all the receipts saved.
Her idea was I can keep the stuff shell just get new ones through the business money. But is that even fair? We just started our business so we dont even have that much money. And not only that but why does she get newer equipment?
I dont really know what to do in this situation.
Does this sound fair?
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