I thought you would like to hear an update. After finding more proof of friendship, and explaining all bank deposits, the visa was granted in a new application through the same means, and she is now in the country. So I guess it answers that question regarding authenticity of the original refusal, although that probably doesn't put you at ease regarding UKVI's competence.
My Chinese girlfriend was refused a visa to visit the UK for two reasons. Her bank account had large separate deposits of money from me and her family into her account, which were not explained. So she will write about where these are from. Is that enough?
Also, in her application, she stated I would cover her travel costs. She included my bank statements, a letter from me inviting her, my personal details, my passport, and pictures of us together. But the visa officer wasn't satisfied the relationship was genuine. What more can we do?
Below is a copy of what's stated below 'The decision', typos included, in her refusal notice. No third-party agency was used for her application. All completed using the official website, and visit to official UK Visa office.
I have refused your application for a visit visa because I am not satisfied that you meet the requirements of paragraph(s) 4.2, of Appendix V: Immigration Rules for Visitors because:
You have applied for a leave to enter to visit the UK for 33 for tourism purpose.
You state that you are employed with ******** and that you earn ***** RMB per annum. In support of your application you have provided evidence of bank savings with recent large cash deposits of *****RMB in October 2015, and a fixed deposit certificate of ***** RMB opened on 28 October 2015. It is not clear from the papers submitted how these funds were derived, or they are genuinely available to you to spend on your short visit. You have also stated that your travel, maintenance and accommodation costs will be met by ****. However, I am not satisfied that: Your sponsor has a genuine professional relationship or personal relationship with you V4.3(a).
Because of this, I am not satisfied you have sufficient funds available to cover your costs whilst in the UK without working or accessing public funds. Your application for a visit visa has therefore been refused under paragraph V4.3 (a)/(b)/(c)