Is going on leave considered being employed

I have a friend who is LVN and she went on leave as she had Lupus complications, I saw her in another facility working yesterday when I went to see somebody there. Is this not lying or as as LVN she can be on leave at one job and work another job. its strange though !! She said " I got another job by saying that I am still working on my 1st job". She is on leave. May be she has her reasons.
Lots of people take a leave, find a new job, then when they are ready, quit the first job. In time, she will decide what she wants to do. She can not remain on leave indefinitely.

unpaid leave, she can do what she wants; usually, leave time does not count as employed time for purposes of earning vacation, seniority, etc., and she may be paying her own insurance through cobra. someone from her old employer might be, shall we say, interrrrrrrrested, though, if they're holding her job for her to be nice while she's ill and then they find out she's moonlighting, i.e., not really too ill to be working after all.

she has to do what is best for her. maybe she has her reasons. i hope you give her the benefit of the doubt and not report her.