As far as I know, "adjuvant interne" is not a technical term in psychoanalysis. For example, the term "adjuvant" does not appear in the French-English-German psychoanalytic glossary of the European Psychoanalytical Federation:
http://www.epf-eu.org/Public/GlossaryList.php?ID=3194&letter...
Also, a quick full-text search of the Standard Edition of Freud's works shows no uses of the term "adjuvant," and another quick search through transcriptions of Lacan's seminars shows a few uses of the term in a descriptive or non-technical sense.

Normally, an adjuvant is something that is added to make something else more effective (see: http://medical-dictionary.thefreedictionary.com/adjuvant ). Thus the "immunologic adjuvant" (https://en.wikipedia.org/wiki/Immunologic_adjuvant ). Or, in a more psychological context, hypnosis is sometimes described as an adjuvant; (see: http://ebn.bmj.com/content/5/4/115.long ). In other words, an adjuvant is some kind of external measure.

If an adjuvant is an external add-on helper or auxiliary, how can it be internal, as in the text here?

Now, from what has been said, it seems that the author of the article is criticizing the use of psychological language by teachers. In that perspective, I think that the term is intentionally problematic. It's as if the teacher is using jargon to imply that the child in question lacks the means to provide the correct add-on, or adjuvant, that would make the teacher's educational efforts successful. This implies that it's nothing to do with the teacher but rather is a deficiency in the child, with the implication that the teacher's jargon is papering over the projection of his or her own inadequacies of method onto the child.

I think I would try something like this for a translation:
"The child needs mothering, cuddling, to be babied; I think he does not have the necessary level of affect development; he does not have adequate self-confidence resources, his internal adaptive coping strategies are inadequate or so incompletely developed that he responds with anxiety."

That's just a first try, but what I'm aiming for is a use of psychological jargon to convey that, whatever the problems may be, they have to do with the child's development (as this is viewed by the teacher).


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Note added at 19 hrs (2013-10-23 07:10:11 GMT)
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FWIW, I agree with Nikki that "adjuvant interne" is not a term from general psychology. I focused on psychoanalysis because all of the authors mentioned (Dolto, Freud, Lacan, Winnicott) are from that specific field.