Can Someone Please Help Me Understand 'The Moth'

I can't quite understand the ending. First, let me see if I understand the story correctly...

Sybil has been dabbling in witchcraft for some time now and has somehow managed to lure a guy away from his wife and into her arms. The wife finds out about it and stabs her in the back.

She rushes home, but her mother doesn't take her to the hospital. Instead, they both seem content with the fact that she'll die at midnight (It must be a witchy-thing to know exactly when you're going to die). The mother is very religious and feels that it's better to let her evil daughter die than for her to go on living and continue her evil ways.

But Sybil has one last request before she dies--for her mother to capture her soul from her mouth as it tries to exit the body and stick it in a jar, and sometime before dawn, Sybil will come back to life and fetch her soul.

Her mother does this (It's in the form of a moth), but later she has second thoughts as she doesn't want her evil daughter to go on living, so she tries to break the jar and set the moth free, only the damn jar won't break no matter how hard she tries.

So she gets out Sybil's magic-spell book and does the spell (involving water and dirt and such) that keeps the dead person away from it's soul. Then Sybil comes back to life looking for it. At first, the spell doesn't seem to work as Sybil easily turns the water into milk, but as she approaches the door, she seems concerned about the dirt. The mother tells her to count the grains, and so she does.

And then just as she has counted every-last grain, the sun comes out, the jar shatters, and the moth escapes and lands in the mother's hand. Then we see a quick flash of light, and Sybil falls back dead on the bed, only it's not really Sybil who is now dead--It's the mother.

It appears that the soul transported from Sybil to the moth and is now in the mother because (as Sybil says) she knew of magic tricks that weren't in the book (and apparently soul-hopping was one of those tricks).

So am I close to getting the story right?

So why did Sybil think that she had to count all of the grains? Why didn't she just go straight to her jar-shattering trick and set the moth free right away?

Was she not allowed to get her soul back until dawn? Is that how it works? I thought that she had to get her soul back BEFORE dawn.

And why didn't the mother have to swallow the moth to get Sybil's soul? Apparently you just have to hold it, and the soul takes it from there?

And how did the mother's soul get magically transported into Sybil's body? Don't we need a moth to perform that task as well?

Anyway, I'll have to go back and watch it again and figure this all out, but in the meantime, any ideas would be greatly appreciated.

Thanks in advance as this is my type of episode, an I REALLY want to like it!!