。
Is she coming too?
Literal
She [also-も] come [explanatory-のです] [question-か]?
A polite yes/no question using のですか, which adds an explanatory/inquiry nuance beyond a simple か question — the speaker isn't merely asking whether she's coming but seeking context or confirmation. The particle も marks 'she' as an additional person being asked about, implying someone else is already expected.