If she ended at 6 pm.
practiced for 45 minutes. 6 pm work back 45 minutes, she started practicing at 5:15pm.
watched tv for 30 minutes. 5:15 pm work back 30 minutes, she started watching tv at 4:45 pm
ate snack for 15 minutes. 4:45 pm work back 15 minutes, she started eating her snacks at 4:30 pm.
