But you knew you wouldn't be living there for half a year. The fact that you left it empty to try and manufacture false evidence to support your fraud doesn't change the fact that you were attempting to commit fraud. The only thing you seem to be complaining about is that you're bad at it and are going to be caught!
if she left it empty,they would check the utility bills to see if it was of a reasonable consumption to see to check if she was living there.
the other would be the electoral registration and your driving license and rates.
also as long as snowhite complied -she will be ok
they have silly rules such as if your PPOR settled and there was a tenant in there for 4 months due to the lease and you stayed 1.5 years and sold you still pay CG on that 4 months. however if you stayed 6 months from settlement and then rented it out - u are exempted from CG.