@Sapphire24, you are so sweet! You and your Mama must be very close, and it is so special that you want to take her to Epcot before the last Illuminations.
I know that you probably have a favorite place to stay at Disney World, but sometimes it costs less money to stay at a hotel *near* Disney World. That might help your budget.
Also, if you are really worried about being able to go to Disney World, I would keep an eye on the
Disney Parks Blog. They often will livestream special events, (like July 4th fireworks, or New Years Eve fireworks) because they know that not everyone can come to Disney World all the time.
You could maybe make a special "livestream party" with your Mama, and have popcorn, or even a favorite Disney treat that you make at home together, and then watch the livestream together!