Sleep advice?????

Does anyone have any advice on getting my newly adopted 2-year old to sleep through the night??? We have been through 4 terrible nights since we got home on Wednesday and I am exhausted. She falls asleep without any problems (between 8-9 PM), but then wakes up between 10-11 PM and is up for most of the rest of the night. I am only letting her nap for 2 hours during the day, which I was told was her routine in China and did work when we were there (she slept for 2 hours during the day and then slept through the night). I would appreciate any advice anyone is willing to offer!!!!!!