Or you could just ignore her and do it your own way. That's what I do when someone in a subordinate role tells me something. But I'm a woman so I have to phrase it differently than a man does (sorry to be sexist, but women have to be "kinder" or we get called bossy; umm... waitaminute, that's what you just did LOL oh well).

Or if it has to be done, say:

"My priority is 'X' right now, but I'll get to your 'Y' and 'Z' when I'm done."

Then perhaps give her a task to do, so she sees you are equals. If she doesn't complete the task OR answer your request in a professional and timely manner, then ask her why. If she refuses to tell or comes back with opposition, tell the boss. But make it very clear you're giving HER direction without saying anything too brash like:

"You're not my boss - I'm yours."

Try this, instead:

"That's a good point. I'm going to do it this way though, because it worked last time and it's what the customer/boss wants. For the time being, could you do 'X' (whatever she asked for)? The boss wants it done by 'X' time and I'm thinking you'd do it well. It would help me out greatly."


Never say you're overwhelmed OR that you have nothing to do. For all you know, the boss asked her to pitch in because he thought you couldn't handle it (don't get mad). But if she's less experienced, I bet she's just trying to be helpful (yet not look weak). The phrases I use in place are:

"The clients want X, Y, and Z done and I'm thinking multiple people on the team would benefit the outcome," instead of "I'm overwhelmed and can't finish this all."

"I can take on more work," instead of "I'm out of tasks."

In other words... kill with kindness. Do NOT lose your cool because (especially if you are a supervisor to her) she could come back to hurt you with the help of HR, or even the boss if he likes her more. Sadly, though there shouldn't be, there are always favorites.