The thing is, in this instance she doesn't really care about the property, has no intention of living in it, and is intending to use it to make more money from people, you included.
The suggestions are all funny in a theoretical sense, but she isn't particularly going to care - and I doubt is going to be the type of landlord that instantly runs to investigate fishy smells, poorly flushing bogs, or whatever - she'll ignore it, keep cashing the rent cheques, and it'll be the poor miserable tenants who suffer.
Either sell it, or don't. We accepted 80k less on our wee place than we had bought it for, and it's gutting, but it's more about the availability of other property and ability to sell than personalities, however infuriating they are.
House selling requires a cast iron stomach and gritting your teeth to get it over with as soon as possible - unless you are in her position, just picking up bargains when possible to make a bit more cash.
It's gutting for us skint types, but ultimately she won't care one way or another, you have to salvage what you want out of the deal. If your priority is to sell, just grit your teeth and get on with it. If you can cope with being in the same place for another couple of years and the possibility of not finding another house to purchase, then play hard ball.
Of us it was more important to move.