My helper was ok when she just come and she stay with my son since newborn in the same room. I need to work day time, so i just let her to feed my son during mid-night, she is experienced and has 4 kids of her own, so she can train my son to stop the mid-night feeding when my son is 1-month old.
So, my conclusion is, if you trust your helper and you need to work day time, you can let her to feed mid-night, but if not, you need to do by your own. But don't worry, i think 1 or 2 months, the baby would stop mid-night feeding, so, it's just a short time, good luck to you.