Personally I would bin this plant and start over, and I explain why.
Auto-flowering strains have a timer in their genetic, and no matter what, it will come to full maturity by the end of it's grow cycle, the grow cycle of auto strains is usually 2 months.
You already lost 19 days, of it's life cycle, and you plant has been through a multiple stresses, and it's a known fact that every stress reduces a potency of psycho-active chemical composition, as well as it makes a big impact on finale yield. If you do everything right, your plant will survive but in the best case you will get about 10 grams of very low quality cannabis.
If you want a good quality cannabis, you need to buy next items.
1.Plants Magic soil
2.Good quality perlite
3. Plant magic nutrients
a) OldTimer Bloom
b) bio-silicon
c) catalyst
d) root stimulant
e) magne-cal (depend on your tap water PPM)
d) bloom boost
4. 10 litres Air-pot
5. TDS meter (reading PPM and temperature of water and )
6. Air pump and air stones (same as used for Airoponic system)
7. Soil cubes (personally recommend Root Riot )
heat mat
Tips:
1. Soil to perlite ratio 8 to 2 (10 litre pot = 8 litre soil and 2 litre perlite)
2. Check your tap water PPM, if it's below 150, than you need to add magne-cal until PPM reading will be at 150. (Do this every single watering)
3. Until you see the firs sign of flowering, use only root stimulant, catalyst, bio-silicon at half recommended amount and magne-cal as described above,
once your plant start flowering, stop giving root stimulant and add oldtimer bloom to your nutrient solution at minimum recommended dose, week 2 of flowering, start adding bloom boost at half dose.
4. Cold tap water is usually 10-14 degrees Celsius. Once you mix some nutrients in water, always oxygenate it for an hour with you air pump before feeding it to your plants. Reason for that is, water too cold, and there can be a toxic concentration of chlorine, This process will buffer the water decrease chlorine and increase dissolved oxygen concentration.
5. Do not mess around with pH, if your nutrient solution is pH 8-9 it's normal, let soil do this job. Do not bother to check the run-off, it won't give you the correct reading of you soil pH.
6. To plant a seed, just soak soil cube in water with root stimulant (recommended dose) and oxygenate it, in the water for an hour. Than place it on your heat mat and cover it with visible through bag (shape it into dome). 3 days later it will germinate.