in that second recent pic, her scales do look like they are sticking out from the body a bit. this may or may not be the starting of dropsy symptoms. could be that she's just being a pig about food and is also full of eggs, but i do see those scales starting to stick out.
a 10 gallon tank (or even a 5 gallon) takes up very little space. a 10 gallon can be kept on a kitchen countertop. your betta will thank you for it. moving a 10 gallon is easy! just drain the water, put the fish in a tupperware with half old tank water and half new, and transport everything inside the tank (heater, filter, gravel, decor, and fish in the tupperware). put it on the back seat of a car, it takes up very little space.
you never did answer my question about your water change schedule. if we could please know this, as it could help your betta.