Reported speech: "would do something", or "would have done something"

What would the following be in reported speech?

Q "If I had any money I’d buy you a drink" she said.

(a) She told me she would buy me a drink if she had any/some money

or

(b) She told me she would have bought me a drink if she had had any/some money

Presumably the former (a) is correct. Otherwise for (b), the Question would presumably have been: "If I had had any money I would have bought you a drink" she said