WOW, C. you have so little time. In the future this website has responsible priced items and good quality - they ship pretty fast too. www.wrapwithus.com
Anyway, do as suggested find out her colors, my girls hate pink!
What I did for my daughters sweet 16:
Theme colored plastic table cloths. Decorated with clear glass vases (Michael's 99 cents each) and long stemmed clear suckers (party city has them like 15 to 35 cents each). I put 8-10 suckers in each vase. If you do the flower theme, the vinyl flowers would look great under the vase). You might want to put the clear beads (in your color theme) in the bottom so the the vases don't fall. Took balloons and the balloon weights in purple and silver and decorated the tables with balloons too. Then got votive candles (ours had sweet 16 - purchased from above website) and the confetti in theme colors and scattered the confetti with 5-6 votives per table (light them close to the time everyone gets there). I put m&m's in tulle with ribbon around them to decorate (another edible decoration). The room looked amazing!
Then I decorated a table as people walked in the door with the theme items (our was hawaiin) I put balloons, a guest book for them to sign in (for a 13 year old party I would put one of those clear plastic things that people can write best wishes on - ask at the craft store - sometimes they are like mirrored, clear or black and you can write with certain pens on them - the kids have a blast with this!). We had a DJ and let the kids dance (we had ours at a rec room). We also catered from Aloha Kitchen, they gave us lots of food and everyone loved it. A really great cake and it looks really pretty too (it was gone in a flash- so if it's a big party I'd make two - looks pretty too) Is punchbowl or some call it truffle cake) It's easy to make you have to make it the day before so you can let it set. Email me if you want the recipe it is so easy to make - ____@____.com it's fruity and refreshing too.
Whatever you do - it should be great. I hope your boss plans on giving you a big bonus for such a short notice.
You can also find out if they want to do games like pictionary or other games. I know there are lots of cool ones for that age group, ask around.