In addition to everything ArcSine said, I think it's really more important to consider how accurate your entries are, not what you do them in. I've done companies small enough that Excel would have worked. (I was already using Peachtree, though, so it was easier just to continue using it.) If the records are good and proper balances kept for assets, etc. then you can migrate over to "regular" accounting software starting with any year.
So I'm more concerned about the actual records you are keeping and not with how you are keeping them. (I don't care if you've got index cards in a shoebox as long as you get it put together properly.) A company that size can do a cash basis, but that's a choice. Even for small companies, I've always followed GAAP -- with some minor exceptions since in real life some things are just not worth it. (Even GAAP recognizes cost-benefit and materiality.) But there are companies for which cash basis works out just fine.
I would still suggest, however, that you keep record of your assets, depreciate them properly (if you don't have to follow accounting standards, you can use tax method for that), your liabilities and your equity, and then make sure to close out net income to equity at year-end. If it's a very, very simplistic business, with simplistic accounting, and basically no debt except credit cards or other short-term credit, you could even get away with not doing that -- but keeping the future in mind as ArcSine said.
As for taxes... that depends on the formation. You didn't say where you are. You're using dollars, but well, that just limits it greatly. Where are you? What legal formation is this? Is she working from her home or out of an office? Some of that stuff will make a difference on how you have to handle things for tax purposes.
In other words, it isn't just about size -- it's also about the kind of company, what's going on, how simplistic it is, etc.
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