Advice to get baby to sleep

My baby is almost two months. She has got into the habit of waking up around 10 pm and falling asleep around 2 or 3 in the morning. And it’s the only time she does it. Otherwise she just wakes up for her feedings and goes back to sleep without issues throughout the night. I’m going back to work in about a month and need to break this habit of hers so that I am able to stay awake during work! What are somethings I should try or do? Any advice?