Despite the alternative suggestions, she insisted on _______________.

Insist on/upon/ Insist on doing something:
- To keep doing something, even if it annoys other people, or people think it is not good for you.
- বাংলায়, কোনো কিছুতে জোর দেয়া বা পীড়াপীড়ি করা ।
- Insist on/upon এর সাথে verb এর -ing form বসে।

যেমন:
- He insisted on my going there.
- She insists on doing everything her own way.
- He insisted on seeing her.

Complete Sentence - Despite the alternative suggestions, she insisted on following the original plan.

Source: Cambridge Dictionary Grammar Reference.