The screams, laughter and "wefies" (whatever that is supposed to be) are coming from the other people present. Parse this as:
... made her look like a vampire, she said, to [the sound of] screams, laughter...
If it were the writer smiling, there should be some punctuation:
I look at her, smiling.
In spoken language, you should be able to "hear" the punctuation in the form of a pause.
As written, without a comma, I would have to assume that she is smiling.
Consider the identically phrased example:
I listen to her singing.
I'm fairly certain you don't ...