。
It seems she's gotten her health back to a fair extent lately.
Literal
She [topic-は] recently considerably health [object-を] regained [seems-ようだ].
とりもどす is a compound verb (取り 'take' + 戻す 'return') meaning 'to take back, regain, recover' — productive across abstract objects: 健康をとりもどす (regain health), 信頼をとりもどす (regain trust), 元気をとりもどす (regain energy). ずいぶん is a casual adverb meaning 'considerably, quite a bit, much more than expected' — heavier than 少し, lighter than 大きく. ~ようだ closes the sentence with the speaker's inference, hedging from direct claim to observed evidence.