Verified answer

وإنتي بألف خير يا أحلى عروس بالدنيا ؛

And I am thousand times perfect ! because you , the sweetest bride in the world you are !

it's a response to a greeting. I think someone said to your friend "good night" and she responded by "good night to you too, the most beautiful doll in the world"

calling someone a doll in Arabic , even though it might sound weird in English, is actually a nice compliment. And even though the sentence sounded too complimentary, Arabs tend to do that and it's completely normal. if this was addressed to you, then your best friend certainly loves you haha.

it's a greeting response for (good night) تصبح على خير or (every year you're well) كل عام وانت بخير

it means:

(and you're a thousand times well, the most beautiful bride in the world)

عروس can mean doll (not all countries address girls as dolls) or a newly wed (or soon to be) bride