Thank you Linda! We have no other brothers or sisters. It's just me and my sister and we both are here in Australia. I'm actually looking got an agent, but just overwhelmed with the Google researches as there are so many.
Do you think if we wait for the 870 visa to finish (yes she will be 65 by that time.), and apply for 864 visa first. And apply for 870 visa after that (say after a week's time), and once she gets 870 visa, she can return back to Australia. And with the 864 visa application, how does it work until it's being processes? Can we apply for a bridging visa?
To be honest, all we need is some sort of visa for her to stay here with us, and I've always had a visiter health cover for her and she stays with us. Thanks!