OMG they are so cute!!! I can understand how upset you must be with your neightbor - I would be livid. How callous of her to (1) leave those gorgeous kittens behind and (2) lie to you and dump the problem on you!!! Some people...grrrr...

I hope you manage to catch them soon - as you and everyone else has said, the earlier they are caught the better chance they have of being socialised.

I usually feed my strays dry food only, and when I am trapping I use a wet food (I think it's Whiskas - comes in individual sachets) - that one seems particularly stinky!! It worked well with Ginger and his sisters, and they were only around 7 to 8 weeks.

Good luck, and thanks for caring for them!