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I am a solicitor.
What kind of study does she wish to do in the UK?
Thank you. If she will be studying at a University in the UK, it may be better for her to wait until she is 18 years and then apply for a student visa.
At 18, she would be classed an adult and find it easier to obtain accommodation and so on, if she was to be in the UK on her own without a parent or guardian.
May I help further?
I am going offline now. I hope my response was useful
All the best