Kid accidentally put old used straw which she found in playground in her mouth I quickly removed it should I be worried?

Common problem. Kids are forever putting things in their mouth like dirt, unclean fingers, etc. It is so common that it becomes part of the day to day of most parents. I wouldn't spend much time worrying about it.The kid might get loos stools, but most don't for some reason. Just fuss at her a bit and let it go.
No worries . Don't be worried but be watchful for abdominal cramps and any changes in bowel activity .