The deduction ranges from .1 to a slight brush of feet on the floor to .3 if they actually HIT the floor with some weight behind it.
Also, about the 1/2 pirouette- the athlete will get a deduction for completing the turn too late (up to .3), and also body position. I bet since she's "out of control" and just falls over the bar, she probably has a big arch (up to .3), leg separation (up to .2), etc. A poorly executed half turn is fairly common in level 8 bars, especially in the beginning of the season, but don't worry- it gets better! I recommend that your daughter practice LOTS of pirouettes on floor bars (and lots of full turns) and lots of cast handstands. Tell her that when she's turning to push down on the bar as hard as she can. (or to push her toes up as high as she can.)
That helps keep a straight back, which will help her lessen her execution deductions.