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The advice the others gave is excellent.
I just wanted to add. If while you are talking her through it, if she throws another tantrum at a frustration then you can use the situation to set the groundwork for future problems.
Tell you mother beforehand that you will fix this WITH your sister's help but that you will not encourage your sisters tantrums any longer by finishing what she gets frustrated at.
If your sister throws a tantrum while you are working on the fan with her, calmly tell her that if she will not calm down and continue working on it with you that you will not help her with any more of her problems. Tell her that tantrums are not a mature way to handle things and that if she will not control them, then you will not work with her.
Then, if it does happen again, let Mom foot the bill. MOM really has to be the one to enforce this for the lessons to be effective. If she has to keep paying for stuff then she'll get sick of it eventually and start refusing to help with this either.
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"Always learn the rules so that you can break them properly." Dalai Lama
My Karma just ran over your Dogma. 
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