That disagrees with what you posted earlier (Yesterday 14:43)
"First month i had a a £3k overdraft that suddenly ended and my salary got sucked into that black hole. I was able to pay, but late. 3rd month i paid both month 2 and month 3 in 1 go"
Also, in your opening post you said "I pay £1,200 a month with all bills included" so I don't understand the £1750 and £1850 amounts.
And as for :
"[deposit was] Protected late and I was never informed hence voiding the whole thing from what i understand"
I am not convinced you were never informed. You may have overlooked it, you are somewhat chaotic, but you probably received it. Stop pinning your hopes on being able to use that to your advantage.
Your landlady, by your own account, has been pretty damned decent to you. She forewent credit checks. She allowed use of a communal area without charge. She pays for a cleaner. She only put the lounge on AirBnb to guarantee her income stream because you were not paying your rent on time.
She only moved out six months ago, so this property was likely her home (has she moved out only to move in with a partner, perhaps?) - her mortgaged home which she does not want to lose hence ensuring she pays her mortgage on time and in full by AirBnb-ing. I expect she'd rather have a tenant who paid her damned rent on time, rather than giving her the headache of using AirBnb.
STOP LOOKING FOR LOOPHOLES AND TURN YOUR ENERGIES TOWARDS HAVING A SECURE ROOF OVER YOUR HEAD.
You say "I actually don’t want to move out I need stability but I’ve run out of money". And how exactly is not moving out to be achieved when you have "gone no contact with the LL as don't know how to deal"? Nothing can be achieved unless you talk to your landlady. Nothing. So take your head out of the sand and face up to this situation of your own making. Start be making fulsome and sincere apologies to her, lay your cards on the table and see if an agreement can be reached. Don't fuck her about, stop trying to weasel out of paying rent, and be honest with her. If you keep on doing what you're currently doing, at best you'll delay eviction but eviction will be inevitable.