A Friend Of Mine At Work Today.....all Of A Sudden......got

A friend of mine at work today.....all of a sudden......got very cold.......and her left hand started tingling....and actually her little finger turned sort of blue....(looked bruised, but she said she hadn't done anything.....also a blue spot on thumb.....) and a bit later it all went away.............just wondering if she should have that checked out......seemed very weird to me!!!!!!!!!!!!!?