Outdoorsy, you have 4 or 5 months? She probably doesn't feel the time crunch as severely as you. All my babies have stayed in my room until they were kids, so I've never fought about a baby room. My personal stance is just smile and nod. More normal might be to ask her to pick a deadline, walk backward through the projects so they each have a deadline and ask if there's anything you can do to help? More assertive would be to show up at home with materials to build the closet and start building if she doesn't take the hint. More sassy might be to empty one drawer, lay the baby in it and send her a picture of the baby enjoying her new room.
Pokey, what do you do that you have to dress a certain way? If you have to dress up and skirts are comfy for you, that might help.