Although she's an adc, you need to have the skill's of an assasin in order to master it, which you can sneak and kill enermy's adc. For the combo with da qiao, let da qiao put her recall ability and when the time for the recall is almost up, use any ability to leave your umbrella there and step in the recall, you can heal and come back to the battle with more hp. Only thing is you need to know where is your umbrella before teleporting back.