Awww hun, you have EVERY right to your anger. What you're feeling is valid. I know what is meant by repeating the 'work thru it' process, I have to rinse and repeat a few times regarding my brother and the fact that he molested me AND the fact that I never told anybody.
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Your mom was supposed to protect you, and she failed you. That's a HUGE cross to bear.
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Go easy on yourself, do something nice for you. Screw the carpets! If she mentions them, point out the fact the she would've mentioned them regardles.
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Sending lots of love your way