A.Oral health expert
It is not possible for the "blackness" of one tooth to spread to the next if it is due to a dead nerve.
Caries/decay between two teeth can cause cavities on adjacent teeth.
Does she sleep with a bottle? If so stop this immediately as this is the major cause of decay in babies.
We normally (in our practice) don't let the child sit on the chair if they are very scared, but merely film them on our TV screens which have an intra oral camera where we can examine mouth quickly.
If she is need of major treatment, you could consider general anaesthesia. However, the cause of the problem needs to be ascertained first. Good luck
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