Do what fits in with u ....my one use to clean the house all morning then have a 2 hour break for lunch n rest. Like 12 ish to 2 pm so I'd come home from school run around 2 ish and she d be ready to help with ironing dinner who he out with the kids.
What hours does she work? Did you discuss an hours lunch break? I think its quite Sri Lankan to have a break like this, my old help would have an hour or two early afternoon.