As it is, the proxy is invalid. It should be in the capacity as the executor of the deceased estate, with the relevant documentation attached, such as the will and/or grant of probate etc.
Otherwise, the proxy could be in favour of that person as the person who has the beneficial interest in the property, but again it would have to have the relevant documentation attached, and it would have to be signed by the executor who is the same person so that would be pretty circular.
In terms of transfer of the property, I don’t think there is necessarily a time limit. However, the executor of the estate wouldn’t be doing their duty if they didn’t take steps to effect the transfer, so query why that hasn’t been done.
The executor hasn’t done it right, as the transfer into her name hasn’t been done, she should have just advised that the person was deceased so it could be noted that the property was currently held by the estate. The strata roll should reflect the certificate of title, subject to any interest that has been notified.