That depends on your animation. If all your frames operate with her above the floor, then she will. There is also a python script that drops the actor to floor in all frames (same as pressing Ctrl-D)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.