Previous good sleeper turning into a bad one?

Sorry to hear about your child's discomfort during sleep. You may want to talk to your child's health care provider, as perhaps your daughter has been waking up due to pain or other medical causes. See her pediatrician to rule out an ear infection. Also, does you child snore at night or stops breathing in her sleep? If so, sleep apnea or enlarged tonsils or adenoids should be ruled out.