Putting a bit of cinamon just on the cut ends is OK.
You need to be strict with your mum: no more watering when it's still damp! You've got a clear pot so make the rule that it doesn't get watered at least until the roots down in the pot have gone silvery (better to go a bit over this than under probably). Water it at the sink so any excess can drain away too.
Don't cut off the dried out roots: the roots have an absorbant outer layer and a core that transports water. If they are green further down then probably the core is still working. It's normal to lose a few roots when changing from one medium to another. Hopefully the plant will soon put out some fresh new roots. It looks pretty healthy overall.
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