leaving a rented house?

I have just moved out of rented house and havinglived ther for five years i have had to put up with alot over ther period ie-had no kitchen for week as had new one, house had flees when moved in,inwhich i had to buy own carprt as landlady never got back to me,had damp downstairs which meant walls being taken to bare brick and treated inwhich me and little boy had to live upstairs for about four week while still paying full rent,was told that while things like new light fitting,electric fire and new stair carpet being done all on different occassons i could not be in the house,i have never complained once,and got a really nice reference saying how good a tenant i was and people like me are hard to come by,when i left i did not paint house back to colour was but colours were netural ie -magnolier and lemon when i contacted her she said i was a disgrace i had never cleaned the front door that apparently she had replaced for me,even though the old one had cm gap down side she then went on to say that i had left nails in walls were pics had been.to me i left the house clean and in better condition than when i moved in she is refusing to pay back deposit as it will cost her over £600 to get placed fixed!!!!! When i moved i also told her that due to when they built kitchen around my washer there was piece of wood over washer i could not pull out as i didnt want to damage kitchen she thanked me for letting her no and said would drop off at new house i never gave address saying i live across from mum,this was before her ranting after her ranting she came with some bloke they drove up onto kerb into my new garden making horrible wheel marks in ground and she got out opened back door of van and the bloke pushed out my washer which is now not working today i have had text saying if i wish i can meet up with her husband at my old house please help sorry to rant but at four months pregnant im at my wits end