You don't want to accept the love and make her as your girlfriend/life partner because "she is beautiful".
Because a relationships beauty is love. If you can't love your partner, then you will definitely waste both of your time and energy.
You just wanna tell her the truth that,
She is beautiful and you don't like her.
Nope don't say yes to her in the end she is gonna hurt so bad maybe she ll feel bad for herself