My name is Mike:How about using the words "grin" or "smirk" which both can be used couple with emotion as in "she quickly shot a nervous grin toward them as she walked by" or something to that effect?For the delivery of the smile you can use things like:She gave...shooting over a short, fear-filled grinsmiling carelessly she....Then there are times you may not even need to use the word for a smile or grin. You can simply describe the situation and allow the reader to envision the expression."Casually walking, careless and lightly as the sun beaming down on her skin, the corners of her lips rising with each thought of her.... .... or whatever the case is in your storyline.Hopefully this helps, keep in mind you don't always need to use the direct words to get people to envision what is going on. It just takes a minute for those "wheels" to spin up and get us thinking a different way about description.Take a moment and leave me a rating if you found this helpful, its the only way I receive payment from JustAnswer for my time with you. And if you like, we can continue with other things too.