Based on my experience, the lower rates and the materials out there are because many indigenous women are kept in maximum security, which limits their access to programming that would address risks for reoffence. This definitely impacts on whether or not they are deemed to be good candidates for parole. They don't have the resources in maximum security that might otherwise be available to them. When that happens, they are stuck in that situation if they're not able to access lower security.
Further, their release plans are not being investigated properly by Correctional Services, for example, if they wanted to access a section 84 parole release. The process to do that is outlined in Correctional Services policy statements, and it's very complicated. Risk and institutional progress and release planning are all factors in parole grants, and because of those circumstances, indigenous women would have much lower opportunities for parole.