Yes, your friend needs prior entry clearance before she can visit the UK. She can apply for general visitor visa by downloading the form at:
She can lodge the visa application form, supporting documentation and fee at British missions at either Geneva or Zürich. If visa granted, it would be 6mths and your friend would not be permitted to work here in any capacity or claim public funds.
If you wish to sponsor her application, you can read your duties as a sponsor to maintain and accommodate at:
Hope that helps. Kind regards
Please click green button to accept answer.
DISCLAIMER: Answers from Experts on JustAnswer are not substitutes for the advice of an attorney. JustAnswer is a public forum and questions and responses are not private or confidential or protected by the attorney-client privilege. The Expert above is not your attorney, and the response above is not legal advice. You should not read this response to propose specific action or address specific circumstances, but only to give you a sense of general principles of law that might affect the situation you describe. Application of these general principles to particular circumstances must be done by a lawyer who has spoken with you in confidence, learned all relevant information, and explored various options. Before acting on these general principles, you should hire a lawyer licensed to practice law in the jurisdiction to which your question pertains.
The responses above are from individual Experts, not JustAnswer. The site and services are provided “as is”. To view the verified credential of an Expert, click on the “Verified” symbol in the Expert’s profile. This site is not for emergency questions which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service (last updated February 8, 2012).