Is it possible for a vrla battery to reach 0.2 v?

Yes, its always "possible" for  battery to go Dead. Its always" safe" so  long as you don't slap a 60 amp  charger on it and leave it a week.. Use a 2 amp trickle.

Recharge? Depends.  The more you flatten a battery, the less its life. I left  lights  on 3X on my Harley; in a year that expensive new  battery was toast.

 Lead-Acid batteries can go Very dead, build up internal sulfation that makes for a  high resistance. A dead battery saved a few kids' lives, once. They were playing with stolen dynamite and caps, they tied  one to a cartridge  and connected its  15 -foot leads to an old car battery. Lucky for them the internal sulfation  precluded one lousy volt to the cap.

I suggest U wire the lights thru the ignition switch/relay so they go off without key.

@Anon. A Little knowledge is a Dangerous thing.  Like, those kids and the 'powder......My Harley's 22A/Hr batt Did read  about .2 volts after 12 hours ignition  and Headlamp On....

The battery has run flat. That's possible when you continuously draw current from it. Put the battery on a slow charge for a day. That should bring it back to life.

Unless it is wrongly installed (and assuming the range was not set to tens) there is no way the battery to discharge that much in 1 week.

Depending on the age of the battery and as long as it hasn't been frozen. You should be able to trickle charge it back to life. If you do not have a trickle charger simply put one automotive taillight bulb in series and that will limit the current

she forgot to turn it off so the battery drained. Recharge it. Thats how its possible.