What does it mean when a girl says woooowww?

haha that's funny and she was laughing her *** off which is a good sign, nd stop reading so much into her txts, she thought it was funny nd said wow as in "haha did u rlly jst say tht? that was cute and kinda unexpected!" so yah just chill and answer back as if she just said lmfaoooo without the wow.