I think they would have been less confused if you wrote it as "Tilly(?)" rather than without the parens, which makes it look like the end of a sentence and the

I think they would have been less confused if you wrote it as "Tilly(?)" rather than without the parens, which makes it look like the end of a sentence and the following comma a typo. I'm guessing you were unsure of her name or the spelling of her name.