Pls help on this situation,

I am currently living in the UK, and have been planning to get married to my partner who is back in Nigeria. We have been discussing a number of matters and today something which hadn't been discussed before came up.
She said that she "wants to be financially secure" and "would rather stay single than marry a man who can't take care of her" I asked her to she said that she is willing to work, but that any money she earns in her job is just for her, but the husband should provide all other things such as shelter, food, etc, but shouldn't take her from her own savings.

I explained to her that here in Europe, it doesn't work that way, I explained to her the concept of a mortgage, and that if a typical family has a family 3 bed house out here, both partners contribute to the mortgage. That things are different than in Nigeria, young couples go the bank together and get a joint mortgage. I explained that here, a couple go out for dinner and they often times split the bill, they have joint bank accounts, and that they budget and invest, save together.
She was astonished and still maintained that she doesn't believe that. "the husband must provide shelter, why should she contribute to the mortgage?"

Now I fully nderstand how things work back home, the guy would own a house(outright, no mortgages etc) and would woo the woman. And I explained that if I move back home after the wedding, I can do that. However, here with mutual funds, gas, taxes on everything, investing , etc etc it is slightly different. I was explaining to her how we buy houses here via 25 year mortgages etc.....we are oth late twenties.

Much of this is cultural. She has never travelled outside of Nigeria.....meanwhile, although I am Nigerian, I have actually spent not too much time there.

Can you folks offer any advise as to if either of us here is being unreasonable, and those abroad, how can I explain to her better how things work here in Europe?
Thanks

If both are working, both should pay the mortgage because you guys are getting married.

If you are the sole breadwinner then you pay the mortgage.
If she is the sole breadwinner then she pay the mortgage.

It is not complex and rocket scientist.