Klm Cancels Ticket For African Girl Flight Saying "didn't You Know African Women Only Travel With Husband Or Father?"

This is a real story that happened today. After making sure that my GF (African) can fly to spend her vacation with me in Ecuador, I bought us both flights, booked airbnb, booked car rent, etc etc for over 5000 usd. To make sure that she can fly, I asked her to write to KLM support email and they responded that she can fly connecting in Europe without a problem. Same info is on their website. Today at the airport the poor girl comes to check in at KLM stand in Nairobi and what they tell her is "you can't fly without husband or father". When she takes out her phone to record this weird KLM rule, they start saying that she needs an EU visa to fly. When she askes them to see her conversation with their KLM co-worker or to check the KLM website, they refuse. 4 hours later she leaves Nairobi airport in tears. KLM did not even give any paper notice about her cancelled ticket nor they sent an email despite her and my demands. What will they say tomorrow, "a no-show"? she recorded some part of the conversation with them.

Our moral and financial loss due to this unlawful KLM behavour is huge. There's absolutely zero reason why KLM would have the right to do so. We were totally prepared with all reservations and insurances etc etc. What we were not prepared for was the spirit of KLM airline company.

Please help! what can I do now?