Will she be applying from and traveling from South Africa?
The best way to do this is to prepare and execute (ie. swear) a sponsorship declaration. This is a document which states who you are, who the applicant is, that (if) you will house them when they are here without the need to access public funds and will also if necessary support them during their stay here wiithout the need to access public funds .
It should also state that the length of their visit is to be no more than the 6 months permitted under the visitor's visa.
It will have to be sworn as statutorty declaration and you can get a local immigration solicitor to prepare and swear it for you for approx £50+VAT.
It should then be passed to the applicant to submit with their application.
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She should disclose the pregnancy to the UKBA in her application, but it should not be a problem. She should check her travelling times with her air line to check they allow her to fly though.
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