It has been reported that Brückner had an accomplice. Since German authorities have not appealed for information on such person, it may indicate that the identity of that person is already known and that s/he is already cooperating in the investigation. My thinking.
I agree with that assessment. I believe the alleged accomplice is known to the police and has been questioned by them in Germany which is her home.
It may even be possible that she is the woman seen at different times outside the apartment by Jes Wilkins and Mrs Murat.
According to media reports I believe this alleged accomplice was the spotter but didn't actually carry out the burglaries so finding out retrospectively the end result of this one was Madeleine's abduction probably came as a bit of a shock. I imagine police will want to know what she might have known and when and there might be huge implications for her as a result.
So I think she may be another who for her own reasons finds nothing the least bit laughable in the heat from the abduction.