You did supply all details of her mother,father, daughter in applicaion, such as dates of birth ID card numbers. Copies of her bank statements. Letter of inivte from you stating your address, copy of your passport, copy of your own bank statement showing you can support her for the time in the Uk. List of potential place you would viist in the UK. State you will pay for all flights. Dont ask for 6 months just give estimated date of arrival and say only staying for a month.
If its an Australian document then it will probably be the Australian Embassy in Bangkok. You will have to book an appointment, it could take 5 days to do and looking on their site the first avaiable appointment is sometine in October.