That account arrangement does create complications. I'm not an expert on these rules, but I don't think what you want to do will work. It seems to me that any money that's deposited in account A is assumed to be half yours, at least in the absence of any other evidence. I think writing checks, rather than doing electronic transfers, would solve the problem, even if your daughter deposits the checks in her joint account with you. If your daughter is not nearby and you're worried about mailing checks, send them by registered mail or by FedEx. You can insure them for the total value.
You might want to consult a local tax professional or tax lawyer. You can also see if anyone else posts a different opinion here.
