My daughter's employer did not withhold federal taxes from her wages and now she is having to pay is that legal? My daughter filed a W-4 with 0 allowances? Help!!!

My daughter reached out to former payroll dept and was told she did not claim any allowances, When you sign a w-4 and told to enter 0 for allowances, does that  mean the employer has the right to withhold by making my daughter liable for paying $$$$$ her taxes? Whats the use of the W-4 form if to screw employees over? Help my daughter is liable for $1400 in taxes this year..