When Worlds Collide - Harry Potter x Twilight

Hermione and Bella are sisters, twins, from two different worlds. Hermione is from the wizarding world while Bella is from the muggle world. When they were born, Hermione was given up for adoption while Bella stayed with Rene and Charlie. A lovely muggle family from England adopted Hermione. When Hermione was 11 she received her acceptance letter from Hagwarts. When Hermione was 16 she found out she was adopted, however, decided not to contact her birth family. Hermione went through a whirlwind of events during her 7 years at Hagwarts. During her last year at Hagwarts, she fought on the front lines during the wizarding war. Two years after the war, she decided to get away from England for a while and contacted her birth family for the first time, asking if she could stay with them awhile. They happily agreed to house her until she was ready to return to England. While with her birth family, she discovers that the muggle world has supernatural beings as well. She hides her magic from everyone while with her birth family. At least until something happens that forces her to use her magic.

What is the event that forces her to reveal her true self?

Follow Hermione as she finds solace in a new world and goes through several more events that put her in danger.