Chelsea boss Sonia Bompastor was sent off in stoppage time after a confrontation with Katie McCabe, leading her to claim poor officiating cost her side the tie.
"If the VAR again is not able to check that situation, I don't know why we have VAR," Bompastor stated regarding the unpunished hair pull. Arsenal will now face either Lyon or Wolfsburg in the last four after keeping their title defence alive.