The browning on leaves could have something to do with overfeeding her a couple of weeks ago.
Too much N can lockout K,Ca and Mg.I suspect K lockout,but without pics im not sure.
I dnt think your last feeding of 295ppm will have harmed her,unless you are now underfeeding.
With browning happening on middle leaves it shows it is likely a mobile element (N,P or K).
Did you give her some nutes in the last water of flush? If you did,what ppm?
If you didnt,and you are away til thursday,it could be a bit worse by the time you get back.
Autos dnt like too many nutes,but they still need food.
You cnt do much about it tiil you get back.Dnt do anything else to her til you put pics on.
If i cant help you,there are plenty of helpful growers on RIU who will.
Dnt worry too much,she is fixable.
Merry Xmas pirate.