Wait until she has stabilized to the separation to make any needed changes in these areas. Establish new rituals for yourselves. Going out for pizza every Friday, or with friends to the movies once a week may help normalize your routine together. Check for local groups for children going through this transition and for single mother support groups for yourself. Taking care of your needs right now will benefit her, too.
Children do adjust and they are truly resilient.
However they do need special attention to feel secure through such a major life transition. Be sure she has opportunity to express her feelings through play, as this is a child's avenue for adaptation. Your daughter is mourning the loss of the family unit as she has known it since birth. Be patient with any tantrums or anger at this time. Be sure you have some art supplies available in your home and offer her ways to draw, to paint and to hear and tell stories about the changes she is experiencing.