She says everything is fine but I know it's not. What do I do?

OK so I asked my female friend how she was doing and she said fine. I knew she wasn't fine, because her eyes were red and it look like she was crying earlier. I tried comforting her and she seem to be a little bit more cheered up but did I do the right think. should I have asked her if she was crying? for future knowledge is it OK for a guy friend, NOT BOYFRIEND, to ask a female friend "have you been crying?" just want to know if I did the right thing?

Thanks
She says everything is fine but I know it's not. What do I do?
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