If she goes on command on the grass, I don't see that this is going to be a problem much of the time. If you feed her at a particular time and not free feed, the times she has to go potty will also be predictable, organize the feedings and potty breaks so that they happen when you are there.
Additionally, if you feed a high quality food, her poops will be small and not difficult to pick up and dispose of, should it happen that she needs to go while you are not there.
Additionally, if you feed a high quality food, her poops will be small and not difficult to pick up and dispose of, should it happen that she needs to go while you are not there.