The correct answer to this open question is the following.
The type of credit would be most helpful and the least risky for her is a secured credit card. This the best type of credit Anya can use by the kind of business she runs and the type of necessities she has. This secure credit has to be backed by a certain amount of cash deposited by Anya. She makes the deposit of the money she considers is going to use and that is why she limits the number of purchases and the amount she can do.