I would go on line and do it. It is the same as calling the florist where you live b/c they will just wire the order to her city and then a florist there will make the arrangement. If you go on line to say a place like Pro Flowers.com you can see what you re ordering. Just do a search for flowers and you will get tons of these sites. Also check naughtycodes.com to see if there are any codes for cheaper prices. If you have the Entertainment book there are lots of discounts.
My only suggestion is when you speak to your aunt ask her about the quailty of the arrangement. If it is not good complain and ask that another be sent. This would be my suggestion for ANY flower delivery company. I used to be a florist for 18 years(still wish I was) now I am a teacher.