Question: > 
> Annie said that she couldn't do anything with Helen Keller unless she had her all to herself. 
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I'd like to paraphrase the sentence as the following. 

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> 1. Annie wanted to have Helen all to herself **because she wanted to control her completely.**
> 2. Annie wanted to have Helen all to herself **so that she could manage her completely.**
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Are my sentences correct in meaning to the original sentences?

Answer: 
I think it means:

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> Annie wanted the complete and undivided attention of Helen.
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The second sentence is almost correct. But I wouldn't use "manage". Manage is to control. I don't think Annie wanted to control Helen, but wanted her complete attention, so as to help her.
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> ...all to herself.
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Means **without outside influence or interference**, there is a certain amount of controlling and **not sharing** which is implied, but the controlling may or may not be egregious to the point of domination. Imagine that Anne got what she wanted, consider the statement:

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> She had Helen Keller **all to herself**.
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This means Anne **only had to deal with Helen Keller** and no one else around Helen Keller: doctors, nurses, relatives, pets, etc. and also that Anne could **make any and all decisions** she wanted to about Helen Keller.

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> I wanted the bowl of cereal **all to myself**.
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Not only means, I **do not want to share** my cereal, but also I don't want anyone telling me **how** to eat my cereal (with milk, without milk, how much milk...)