She can file.
But she has no legal standing to demand a recount on behalf of another candidate.
If she goes through with it, they’ll ask her representatives if they think it would change the outcome.
They’ll admit it won’t and then they’ll tell them to go to a judge to get one.
As far as conspiracy theories go, this one is a stretch.
"Any candidate voted for at any election may request a recount..."
There is no requirement, restriction or assumption that would preclude it being a total recount including all candidates for the contested office.
I fail to see where stein does not have standing to request a recount.
If she goes through with it, they’ll ask her representatives if they think it would change the outcome.
It won't change the outcome for her but the whole premis is that it could change the outcome for the winner if alleged fraud took place.