help plseeeee

my babys bday is coming up i want to buy her a smashing cake and have her wear a tutu its to late for me to order anything online because it won't be here til after. I dont want to buy anything super expensive either because she will be having a big party just not her actual birthday.

any ideas. or diy that I can do super fast inexpensive just to celebrate that exact day of her bday. and have memories 😩