So wait person A has a tree in there property not overhanging and causing no issues for person A but B-F want her to pay to cut it because b-f want more light. You should be paying to cut it not person A.
Person A chucks all her waste in the garden and there is a foul smell and vermin. Person A likes rats and the smell of rotting waste. Persons B-F want Person A to clear it up just so it is more pleasent to sit in their garden? They should be paying, not person A.