She orders 2 scoops of ice cream that's $1.00 per scoop so the ice cream costs 2*1 = $<<2*1=2.00>>2.00.
She wants double syrup. The syrup is $0.50 so that will cost 2*.50 = $<<2*.50=1.00>>1.00.
The brownie is $2.50, the ice cream will be $2.00, the syrup will be $1.00 and the nuts will be $1.50 bringing her total to 2.5+2+1+1.5 = $<<2.5+2+1+1.5=7.00>>7.00.
#### 7