Ask an Immigration Solicitor. Get an Answer ASAP.
My name isXXXXX and I am a Solicitor based in London. I'm happy to help with your question today.
Will this be paid employment?
food and shelter and an allowance
How long will she stay?
for several years
She could apply to come as a domestic worker ONLY of she has been working for you for 12 months. Otherwise the only other visa is general visitor for a maximum of 6 months. There is no provision for a citizen of the Philippines to enter the UK and stay for years in the circumstances you have outlined.