Does she have a detailed inventory, protected deposit, legal gas/ electrical certificates, How to Rent guide, etc?
This ^
Also, add a valid EPC to that list.
Make sure everything is documented in an email, even tiny things, eg stains, marks, scratches, cleanliness, flies in the fridge, and contest the inventory if they are not already listed. Take photos. If there isn't an inventory, this is even more important.
You could ask the landlord to have the property professionally cleaned but that means your DD will have to leave the property cleaned to a professional level. What does her contract say? If it specifically states that she needs to leave it cleaned to a professional level, she should demand that it is cleaned to that level at move in.
The landlord has to maintain the structure/fixtures/fittings of the property and make repairs in a "reasonable time". Reasonable depends on the nature of the repair eg health and safety issues need dealing with urgently. If they don't, your DD can ask environmental health to inspect the property and compel the landlord to do the work.
If the toilet isn't functioning (and there isn't another toilet in the house), that would be considered an emergency as it is a health and safety risk. The landlord needs to get someone out today.
The bedroom door handle, window catches are also safety risks in a fire but not as urgent as the toilet. I think 48 hours would be reasonable with some leeway if the landlord genuinely cannot find a workman. Point out that they are a health and safety risk in the email.
The wardrobe is not urgent. 14 days would probably be a reasonable time frame.
Is the property rented as unfurnished in the contract? If it is, she can insist that the furniture is removed. If it is described as part furnished, she might be stuck with them.