Hi again Teresa!
As I was thinking over your question, I recalled your
first question, and then I also noticed that you show up as residing in Florida.
Florida residents do not have a discounted two day ticket option. If your (very cool) Mom is gifting you admission tickets to the parks, and you are indeed a FL resident, you are able to receive those tickets at the FL resident rate by showing your valid FL resident ID at the guest services window. Currently, an adult base ticket for a FL resident is $73.80 for one day, and $135.00 for three days (all prices subject to change).
If you are not a FL resident or do not have valid FL resident ID, then general admission tickets are as follows:
An adult base ticket is currently $87.33 for one day, $172.53 for two days, and $238.56 for three days (all prices subject to change).
To upgrade your ticket once you arrive at the guest services will call window, you'll be required to pay the difference from the ticket you currently have to the ticket you are upgrading to.
I surely hope the information I've provided you helps! If you'd like to contact Walt Disney World directly, you can find their contact information
here, with a phone number for ticketing matters on the right menu for your convenience. Please let me know if you need any more help with this or any other matter in planning your magical vacation!