Alyssa Renee Gutierrez, 23, from Las Vegas, met fiancé Peter, 57, on a dating app
Said they had instant chemistry on their first date and quickly fell for each other
Peter proposed to Alyssa, making her stepmother to his adult children
The gambler s eldest daughter being just three months younger than Alyssa
Said they face constant backlash from strangers who brand her a gold-digger