A quote from Margot Sunderland's 'What every parent needs to know':
"In the 1960s, research showed that some children who were left with unfamiliar people for several days went into a full-blown bereavement response, which left them reeling from the trauma years later.
One little boy, separated from his mother for just 11 days, stopped eating, cried endlessly, and repeatedly threw himself on the floor in despair.
The researchers observed countless other children who had been left for several days and were in a state of yearning without end. Many would stare, for hours at a time, at the door through which their mother had left. They did not want to play; they just wanted to watch the door."
I appreciate that the OP is not planning to leave her DD with a stranger, but a nursery worker is not a primary carer and her DD is unlikely to be securely attached to said nursery worker as she is likely to be one of several adults looking after her at the nursery rather than sole carer (please correct me if I'm wrong in this assumption OP).
OP, your DD will not understand that you are coming back. She will start grieving for you and she will be very sad.
I don't usually post such strong opinions by the way, but I really really hope you rethink your plans OP.