I realise from your comments that this is not your property but there is something to be learned from the views of those who have had to rehab properties damaged by cat urine.

Just take her to l claims court, she may choose to pay once she realises how serious you are.

After buying - by chance - a 'high cash-flow' apartment as first property in Malta, my husband and I realised that Real Estate Investing could help us reach our goals: financial, geographical & time freedom.We are already working online, allowing us to travel frequently for long periods of time.

I wish more investors were aware of the true risks of this business and realised that it is higher than most investors will admit to.

I realise it's a hard question to answer given that no 2 scenarios are alike.

Give her some time to come to the realisation that her plans are not practical then convince her to sell it. 

I realise a lot of it was on me going with her, but jesus she was bad, if not the worst.

There are far more people then you realise want this. 

@Jon Sheffield I see, I know about listsource but I didn't realise someone would want to go further down the rabbit hole.

Wait till she realises her mistake herself then step in to help.