。
She helped me shovel the snow.
Literal
She [topic-は] snow-shoveling [object-を] doing [object-を] helped-for-me.
雪かき means 'snow shoveling' — かき from かく ('to scrape/rake'). The structure 雪かきをするのを手伝う chains a nominalized clause (するの = 'the doing of') as the object of 手伝う ('to help'). The ~てくれた ending marks this as something done for the speaker's benefit — 'she helped me' rather than a neutral 'she helped.'