Autofloreciente No florece

This is the consequence of half ass breeding practices. This is almost certainly not an autoflower. Kill it off unless you want to/ have plans to run a cycle of 12/12 for 2 months..

Just flip it to a 12/12 light schedule when the rest of the autos are harvested and see what happens

You should have already harvested this plant if it is indeed an autoflower.. so if it's not even flowering, you're not going to get a harvest... BUT It's also entirely possible that you got a photoperiod in that bag of seeds so you're going to have to tell her when to go into flower by flipping her light schedule to 12/12. Since she's in with 11 other plants, you might accomplish this by simply taking her out of the tent and putting her in a dark room that gets NO light for 12 hours of the day... if she STILL does not start producing flowers, then you should forget about her as nothing is going to happen - but give her about 2 weeks to start showing her flowers. Good luck!