Hi Mackenzie,
Welcome to planDisney!
Let me first say any extension of a stay in the magic makes me happy so I can feel the joy in your question! I also have been in a similar situation in the past, unable to modify an existing reservation and keep the same
Special Offer. Certainly go ahead and make the reservation if you can! Then, when you get to the
Disney Resorts Collection hotel, check with a cast member at the front desk to see of they can keep you in the same room. Although it's not guaranteed, they will certainly try their best!
If you do have to switch rooms at the same resort hotel, you can leave your bags with Bell Services and then they can deliver the bags to your new room once it's ready. Although this may not be ideal, it is fairly easy to do. When we have done such a move in the past, we have just dropped our bags off before heading out to a theme park and then, when we returned, we called the Bell Services desk and a cast member brought them to the room.
As you finalize those plans, I do hope you keep your eye on the
Disney Parks Blog for news that might be related to the dates of your visit. My girls and I are really looking forward to the opening of
Tiana's Bayou Adventure. The Princess and the Frog was the the first movie they saw in a movie theater, so it has special memories for us. If you have not already done so, consider
Memory Maker for your trip. The photos we have from past trips with Memory Maker have been priceless.
Mackenzie, keep up the fantastic planning, consider a few special dining locations, and make those
advanced dining reservations. You are
almost there!
Magic and memories,
Donyell