I would recommend using a lunge line in a round pen. Do have a whip handy in case she does something dangerous, but don't use it on her unless you're in danger. It's definitely a respect issue! You said you bought her two weeks ago, so I am sure shes still adjusting to her new home. It'd probably be a good thing for your daughter to spend a good bit of time w/her, grooming and talking, basically forming a good tight bond w/her.
Have you ever done any training? It kinda sounds like you're gonna have to go back to the beginning and re train her to proper tack and cues.

Was she the only horse these people had? If so that could be part of the problem, she's not socialized. How old is she?