Final answer:
Heather feels regretful about the trouble she caused to Risa but believes she had no other choice and would act the same way again.
Step-by-step explanation:
Based on the information provided, Heather feels regretful about the trouble she caused Risa. The inclusion of the word 'sorry' indicates that Heather has remorse for her actions. However, Heather also believes that she would act in the same way if given another chance because she felt there was no other course of action available to her. This complex emotional response suggests that while Heather is regretful, she also maintains a conviction in the necessity of her actions.