My niece is turning 11 in November and I already told her I'm going to take her for a "girls day" for her birthday. Shopping, lunch and mani/pedis!

I need/like to budget in advance for gifts. So how much would you budget for her "shopping spree"? She totally understands shopping for a deal/sales and her bday is near Thanksgiving so I'm sure there'll be good sales. But I do want to let her splurge on a item or two if she really loves it!

Thanks!