Is it unreasonable to ask someone who ghosted me for proof of life?

seriously crazy ghosting i guess as i haven't seen this girl or her girlfriend's either for like almost 9 months now and they all live in my hometown

she normally had a job as a server during the summer at one of our local hangouts but haven't seen her there for a long time and not even sure if she still works there or planning to come back

unreasonable to ask for a proof of life at this point? like what happened to this person , to be honest not really even interested in being friends with her anymore just wonder what happened to her

Updates
2 mo
i don't have any reasons to believe her or her girlfriend's are not alive , more a way to get her attention and realise how crazy this is to do this. if they had an issue with me should of talked to me and explained why there upset
Updates
2 mo
some of them returned to work this weekend and i saw them but didn't really talk to them or ask what they were up to , is 1 girl who has a new job and not back , not entirely sure why as she had been there for a long time , hope to talk to them eventually when we have more time and moment is right
Updates
2 mo
still not entirely sure what is going on with this place , some of the girls did seem to return last weekend for work but this week they didn't even open patio and place seemed very slow. so haven't really talked to them yet , one said hi and seemed ok to be back but never really explained why i had not seen her in so long , not sure if any of them have any shifts this weekend or not
Is it unreasonable to ask someone who ghosted me for proof of life?
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