What should you do when someone becomes ill at work?

As the other day some young girl became ill at work it looks like she had fainted and was feeling very unwell, but the first aiders didn't really do much they just left her in the room! Is that wrong? What first aid should you give to someone who is feeling unwell? As they didn't check her pulse, should that be the main thing they check as as she seemed very ill. I felt so sorry for her!
What should you do when someone becomes ill at work?
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