Speaking lies to get citizenship

I have a relative of mine who has come here 7 years go, first as a visitor and than claimed asylum saying to the immigration that her husband has used domestic violence on her and her daughters just to stay in the UK. Her husband had agreed to put that claim in with her at the time. 5 years ago her husband has gone back to his country and had applied for a visa for the UK on a number of times and has been rejected because of the wife's claim of asylum. The daughters don't know who their dad is, one is 9 and the other is 7. Their mother is persistent to get the UK visa regardless how it's affecting her daughters. She is lying to stay in the UK and is getting support money too. Obviously her means of staying in the UK are nothing, just a British passport. What does Islam say about this?