。
She was ever so kind in showing me the way.
Literal
She [topic-は] ever-so kindly way [object-を] taught-for-me.
The most interesting element is それは used as an adverb meaning 'ever so, very much, extremely.' This is distinct from the demonstrative 'that is' — when placed before an adjective or adverb, それは functions as an intensifier with an old-fashioned or literary flavor. The doubled form それはそれは is more common today. The ~てくれました ending marks a benefactive action: she did this kindly thing for the speaker's benefit.