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I don't see this as a FN sovereignty issue as the FN didn't even attempt to make a decision in this case because they don't have any independent child welfare authorities or courts to make decisions on matters such as these. If Canada abdicates it's responsibility in this particular case there is no FN system to pick up the slack.
There are First Nations Child Care Agencies. Check out the Aboriginal Peoples Television Network, do a search for leukemia and discover that toxic waste may be connected to a number of First Nations children with leukemia. Discover that they do have views on this matter.
You said you supported sovereignty now you say you don't see sovereignty as an issue, it appears to me that you will say anything at all to argue your point of view and that you will ignore pertinent information if it doesn't support your point of view. I won't participate further.