What's the difference between following sentence:
She kept herself rather to herself in her own pantry.
and
She rather kept herself to herself in her own pantry.
Are there some omitted words in the former?
What's the difference between following sentence:
She kept herself rather to herself in her own pantry.
and
She rather kept herself to herself in her own pantry.
Are there some omitted words in the former?
The word "rather" could mean one of two things. One is something like "a little" or "somewhat". The other is something like "instead". It's impossible to say which it is (although the first would be my guess) without the surrounding context.
However, regardless of which of those two meanings was intended, changing the position of "rather" has no effect. Both versions of the sentence mean the same, and both are acceptable. (However, see Seeowjooheng's answer concerning splitting an idiom.)
Edit
1
She kept herself rather to herself in her own pantry.
2
She rather kept herself to herself in her own pantry.
keep oneself to oneself is an idiom and should not be split.
(2) is hence more appropriate. Alternatively, you could consider
She rather kept to herself in her own pantry.