。
She's going to wash her motorcycle this afternoon.
Literal
She [topic-は] today 's afternoon motorcycle [object-を] washes.
バイク is the standard everyday word for 'motorcycle' in Japanese, despite the irony that English 'bike' is the word for a bicycle. The English term 'motorcycle' shortens to 'motorbike' in British English, then to 'bike,' and Japanese borrowed that final clipped form — but reserved it for motorized two-wheelers only. Bicycles are 自転車. The polite ~ます form here points to a near-future plan; Japanese has no dedicated future tense, so plain present forms cover both habitual and future readings.