Since the UK have shut down all the easy visas to the UK, there have been lots of other tricks used to try to get to and then stay in the UK. If you read the other not so honest immigration sites, you will find what these people do.
Here are two of them-
Marriage, get to the UK and then claim domestic violence. This is now much harder to get as the rules have been tightened due to all the fraudulant claims. I've seen some come unstuck on this as they used an EEA citizen spouse for this, not realiasing that wouldn't work as the spouse must be British.
Have a British child. i.e. get pregnant/get the British spouse pregnant, is another well worn path. When that child is born they then try to use that British child to stay in the UK. You might want to be wary of any reconciliation if she finds her DV route won't work.
Sorry to sound blunt, but this information on how to get to the UK, is all over the internet and the spouse visa is the easiest visa to get, along with trying to get EEA citizenship.