I watched a couple of "UK Border Force" videos on youtube, and I am always shocked and amused that people who are caught working illegally in the UK are not arrested if the police can't find their passports. Basically without passports they can't be sent back to their country of origin, because the country wouldn't accept them. So they are released. Also, if the police does find their passports, they are released told to come back in a couple of weeks to be sent back to their country. Of course most of them don't come back, and simply move house. The whole process is bloody ridiculous.
Maybe this lady can just throw away her passport, so she can stay in the UK indefinitely.
Anyway, it's crazy not to let a wife/husband stay on!