9hours a day at daycare is a long time in my opinion and it is possible that she needs more time with you,maybe cut back so you have more time with her. Do they put them for a nap at daycare as that could also be a reason she isnt tired enough at night. . It is also possible that having spent 2 years in the same room as you she feels usurped by her new step dad , how does she get on with him , maybe have him connect with hermore fun, games reading stories, , attention .When she does get up in the night, quietly, no yelling, take her back into her room , if she isnt tired let her read for a while ,if you are consistant she will get it and realise that she has to sleep in her own room. good luck