Is this Fiction ?

Eiszel Xin Sarmiento came from a poor family, she had an 'okay life despite being poor, but then her darkest days have come and it really traumatized her. She started getting really dominated by her overthinking that she committed suicide. A few minutes to death when she realized that she still wanted to live despite everything, she wanted to correct things. Then, A magical thing happened to her, she have been isekai'd inside a book she reads and her mission is to play the strong lead role who is arranged marriage to a Billionaire!. As time passes, She is starting to fall in love with a Fictional character, Will she still choose to be back to reality?