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Ochaco's saving of Izuku (together with Shinso's brainwashing ability) helped in some pretty big ways that she'll never really know, but as for why, she had her own reasons to do so. As she ended up explaining in the newest episode of the series, her body sort of moved on its own. Talking through her embarrassment (as Mina Ashido had picked up on her connection with Izuku), Ochaco showed how much she's grown since the Shie Hassaikai fight.
As Shota Aizawa helped the students break down everything that had happened during the final fight against Class 1-B, Izuku revealed that he was suddenly overwhelmed by how his quirk started to go out of control and thanked Ochaco and Shinso for their help. When Midnight prodded on the fact that Ochaco had put her body on the line to save Izuku from his trouble, and Ashido bugged her about how hard she held onto Izuku's body, Ochaco grew beet red and explained her actions as best as she could.