I’m going to say it bluntly. My dad was stupid. Don’t be stupid. He married a woman who couldn’t get a visa because it was the only way for her to stay in the country. Within 2 years of marrying him, she had unexpectedly moved her 2 young sons into my dad’s house (which was quite a surprise for him!) and moved out herself. She had moved in with a different man and had 2 children with him. My dad was far too embarrassed to admit this to anyone, and could not divorce her because she said she would take half his assets (he had inherited a lot of property from his mother.) So he did not divorce her. When he died, no copy of his will could be found (funny that!) and under intestacy she was entitled to far more than she would have got in a divorce. And she took it all and tried to get more (claiming the 2 children by another man were my dad’s financial dependents too so were entitled to some of his biological children’s share.) She played a very long game, but it was inevitable she would outlive him as she is younger than I am. She was a manipulative, clever, scheming woman who wanted as many different claims to live here as she could get and to get someone else to pay for it. I suspect she’d hoped the illegitimate children would lead my dad to divorce her, but when he didn’t she sat it out. Her sister did the same thing to a man from a different European country, and is living off the spoils for divorce. My dad’s wife is currently back in her own country, and has used her inheritance to set up a massage parlour where she is on the lookout for another silly well-off white man. Her older sons grew to adulthood living with my dad, and now have families of their own in Britain. She comes and goes as she pleases, and has the wealth now to do so.
You might think all of this sounds implausible and a unique story, but it isn’t. There are plenty of gullible men out there being fed a sob story every day. My dad was stupid - he genuinely did not believe for a minute she was only marrying him to better her own financial situation and life choices. But she was. And we know (because we were told by a disgusted friend of hers) that she danced and celebrated after she pulled this off, saying she could not believe she managed it. Her actions and attitude have caused more upset in wider circles than you could imagine - the above is only a short precis of the years of deviousness of this woman.
Don’t be an idiot like him. If your Chilean girlfriend is in a relationship with you for love, your love will still be there in a long distance relationship. Her haste to marry you is indicative of a need to get a visa. You are just a means to that end. As I suspect my dad was - you are most probably thinking with your genitals atm.
Alternatively, go ahead and marry her, right now. But don’t come looking here for advice on the matter then choose to ignore every single poster telling you how naive you are being.