Don't leave her high and dry because you want things to be a little easier for you. Then again, some parents inadvertently take advantage of the availability of their children. If you think your mother is asking you to work just because you are handy, and she has other options, then talk to her about it. Maybe she'll be willing to put you on the payroll, solving both your problems. Or else she might understand and let you go.
Mothers can occasionally be understanding.
You should resolve this as soon as possible. A situation like this tends to get worse with time. An object's ability to float, or sink, is measured by its displacement. An aircraft carrier can float because, though it is made of steel, its shape includes a large amount of air in its volume. Since air is far less dense than steel, it reduces the overall density of the aircraft carrier.