To describe someone as being very beautiful in Engpsh, you could say:

She is extremely beautiful.
She is incredibly gorgeous.
She is stunningly beautiful.
She is breathtakingly beautiful.

For example: "I saw her at the party and I was immediately struck by how beautiful she is. She is truly stunning."

It's important to be mindful of the words you choose to describe someone's appearance, as some people may feel uncomfortable being objectified or reduced to their looks. It's always best to respect other people's boundaries and focus on their other quapties and accomppshments as well.