....but if she doesn't feel like it and just decides to choof off, there is no big hammer, no over-riding enforcement mechanism that can make her, especially if she is relatively poor.....and even better if she has sick children. The Landlord doesn't stand a chance of recovering any funds whatsoever.
My recommendation to your tenant friend would be to just bugger off and leave everything unpaid and unkempt. The Owners have only got 4 weeks of her bond (max), so that's the most she can lose, and of course the Landlord will have to pick up the full tab for cleaning and bills. If she leaves 2 or 3 months prior to the expiry date of the Lease, the Owner or PM can't do a thing about it.
Tell her don't waste her time reading the fine print of the agreement - it doesn't mean diddly squat when she has gone and left no forwarding address. No-one is going to follow through and enforce anything against her, it'll be far too costly and time consuming, not to mention the stress and frustration involved. Even if the Landlord or Agent try and hold your friend liable, no wet blanket magistrate or tribunal hearing is going to agree with them. They'll just say to the owner - you got vacant possession of the property - move on.
Your friend is in the hot seat of power in this negotiation. The Owner and Agent (PM) have got bugger all power, i.e. no legislative stroke, to do anything against her.
She's in a good possie.
The wife and I found out the hard way, how very difficult it is to enforce an educated adult to do anything at all if they totally disagree with something and continually refuse to compromise or agree on even the tiniest of matters. You're talking years and years of arguing the toss via squirrels to drag someone kicking and screaming to judgement....minus costs for the squirrels....which are typically 5 or 6 times the cost of what you are after in the first place. Beating your chest and using words like "have to" and "liable for" are just words and nothing more.
It's extremely difficult to force adults to do something they don't wish to do. I cannot emphasise this point enough.