Your wife/partner may need to join the UK visa group then she can post any questions on there. I have done all visas including the UK passport myself (obviously with my husband's support) we just followed the instructions/information on the Home Office website.
If she is granted the visa there will be an email or letter that comes with the passport to let you know what to do next. In the passport will be a sticker like in the picture. Cr picture from Internet.
I used Wise transferred quite large amountals to buy the houses in Thailand the fees were cheaper than other companies ( I used the option transfer money from my UK bank to Wise as it was the cheapest fee ) 🙂
I normally use Transfer Wise. I have sent some money for buying the properties as well. The max you can transfer to Kasikorn Bank is 2M THB. (I have sent GPB to THB by the way)