Ifonly, the OP has clarified the Philippina will be travelling from Thailand NOT the Philippines, hence the "major hassle" to get the visa. She would have to apply on the Internet then return to the Philippines for the initial interview then either wait a few weeks there whilst the decision is made or return to Thailand then return yet again to Manila to pick up the visa.
The British embassy make nothing easy for a Philippino/a to travel, trust me.
My wife and child are Philippines citizens, that's why they are currently in the Philippines and I'm back in the UK without them (my baby is 1 month old), because the British government are averse to even giving them a visitors visa.
Why? Hundreds of others do it without problems every day.
Have you ever tried it? Took us 3 attempts and a threat of legal action to get even a visitors visa......Please do your research first without putting comments like this.