<span>Everything you need to make a good meaningful sentence (and grammatically correct, ofcourse), is to follow common rules. Do not forget to provide your sentence with complexity, but you dont have to make them too complicated, I mean you need to use key words, they will make your thought completed. And the second point is that you need to properly organize the sentence using correct word order. I hope this helped. </span>
I would say the second option - "She skipped off, singing"
It gives a visual of her being very happy, instead of just saying she was happy.
