This client I was offering for was not comfortable with that, but he was going to try and have his inspector, contractor, and himself all see the property on the first showing to speed things up and be ready to have funds in the sellers account in less than two weeks.

I would account for 70-80% of purchase price multiplied by the tax rate for the following year just to be safe. 

Account Closed.

I’m talking every single cent that flows into and out of your wallet/bank account.

From what I have learned so far, with my limited experience, you are accounting for a potential protracted vacancy, and should consider allocating some capital to update units when they turn over.  

. $50K can help you complete 2 years of real estate/accounting/finance at most state colleges.

Keep all the money going in and out in an account under the LLC to keep it separate from our personal accounts.

You may have to create an account there, but I just got a 95% LTV HELOC on my personal residence at my local credit union in Colorado.

Does she need a US bank account too?

You have to account for all costs and not just the costs that the previous owner deemed necessary to account.