I have been a teacher in a special education unit and to be honest, most of it is learning on the job. I went in with very little experience with kids with disabilities and I learned while I was there from working with the kids, from the other staff and some training that I attended. Most of the teacher aides that I have worked with also start out with little to no experience but a keen interest to learn. I am not really sure that paying someone necessarily makes them qualified to work with kids with a disability. I did 4 years of teacher training and to be honest, still walked into my classroom on my first day and that is when the real learning began. The parent will have the teacher to support them and give advice and training and I think if she is willing, she could be a very valuable asset. My hat goes off to her a little bit, it can be quite an intense job and she is offering to do it for free.
I have read through your posts and I am trying to figure out what the biggest issue for you is because she is most likely going to get her working with children check approved and that is not going to be an issue - I don't really think that this is what you are actually concerned about (if I was to be completely honest :)). It sounds a bit to me like you don't want the parent in the classroom and you are trying to find excuses for her not to be there because you feel your child will be disadvantaged and you are paying for an education for your child to make sure they are not - I am not trying to be offensive in saying that, so please don't be offended. I am just trying to understand what it is you want out of this situation because unless you can articulate what it is that you want, it will be very hard for you to work out which solutions you will be satisfied with.
I think there are some things about that seem to be out of everyone's control - there is no funding for a full time teacher aide for this child and the school probably doesn't have the funds to provide it so alternative solutions need to worked out. I guess you could try putting yourself in the shoes of this child's parent and thinking about what you would want if it was your child and how you want the school to handle it.
From the perspective of the parent volunteer - if she has just moved here from overseas, the school community might be one of her only social outlets and she might just be trying to make herself a part of the community. Volunteer work is a great way to get involved. I thought that most people coming into our country were screened for criminal offenses before moving here so I would assume (maybe wrongly?) that she has a clean criminal record since she is allowed to be here in the first place.
Please don't take my post as judgemental. I am not trying to be harsh, I am trying to understand the issues for you. I kind of get the impression that even if her criminal history is clean, you still have a lot of other concerns and I am just trying to understand those. I think you are right to question what is happening - if you have concerns it is good to get answers but in many of these situtions it is about a good fit and it takes time to work out whether it is working for everyone. Even if the person was a paid, experienced person it doesn't necessarily mean they will gel will with the teacher, the classroom environment, the student with special needs and the other kids. I think it is one of those things where they have to give it a go and see how it works out. There are so many dynamics and variables, it is impossible to know.
That's my 2c anyway :)

