。
She was kind enough to lend me a large sum of money.
Literal
She [topic-は] kindly [emphasis-も] large-amount [possessive-の] money [object-を] lent-for-me.
多額のお金 (たがくのおかね) means 'a large sum of money' — 多額 combines 多 ('many, much') with 額 ('amount, sum'). The verb 貸す (かす, 'to lend') takes the borrower as an indirect beneficiary through ~てくれた. Lending a substantial sum is the kind of act that 親切にも ('was kind enough to') naturally emphasizes — the generosity is significant and noteworthy.