Dear @Jenpri
Three year old behaviour can be unpredictable at the best of times - old enough to want/need/prefer/dislike and not old enough to fully articulate or comprehend same wants and preferences. Trauma perhaps but more possibly separation anxiety, a growth spurt causing sleep disturbance, or reaction to a climate of some changes to routine or the general atmosphere of the household. You’ve been through a lot and young children are very receptive/reactive to unexplained change. Perhaps time, closeness, reassurance and patience will get her over this phase. Does she go to creche or daycare? Is there anyone else with daily interaction with her you can talk to? Best wishes.