I had no real scarring, and what there was soon faded. However your mother lacks the elasticity and thickness of skin of a younger person, so there may be marks left behind which won't fade.
The worst thing is having a secondary infection from scratching. Applying wet cold cloths I found the best to ease really bad itching. Perhaps using one of your remedies in the water may help too.
The lumps you see are actually eggs laid under the skin, and that is why you need to treat sooner rather than later. It isn't going to go away on its own.
Keping cool is a problem, especially for an older person. You don't want hypothermia added to her problems!
Loose, light, cotton or rayon clothes next to the skin are best. (Or pure silk, if you are rich!)
Sleeping can be a problem.
It helps if you can make a "tent" of the bedding to keep the weight off her body, without risking getting cold. Pillows to the sides and at the foot of the bed will often work, but make sure she can get out of bed without injuring herself! You don't want a broken hip to deal with as well!!!!!
You will need to wash everything she has been in contact with: bedding, clothes, towels etc. Treat the mattress with whatever treatment you feel will work for mites and insects. Will help to vaccuum mattress too, but make sure there is adequate filter. Pay perticular attention to joins, seams, and binding.
Get as much stuff as possible outside.
Sunlight and fresh air are good disinfectants. Even on an overcast day, there is enough ultra-violet light to work.
Lastly, try and work out where the scabies came from.
There is a great stigma attached to scabies - "you must be a dirty person to get it" - but you can pick it up from any person who has it if you are in close contact for long periods.
You may find your Mother is absolutely horrified, and may not want anyone to know. So deal with this sensitively, please.
Good luck.
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