Unfortunately as I said to Mark earlier, I don't know who this woman is or where she lives so I can't really call the rspca. Apparently my friends mum is going to speak to the woman as she's her friend and my friend told her everything I said. Her mum said 'the last 2 litters of kittens have been outside and they were fine' so what my friend said/or was told about these kittens being an accident was probably untrue. One accident is possible, 3 is just plain stupidity. TBH the one I'm most concerned about is the one with the poorly leg, I've told my friend to pass on to this woman that if she has any problems rehoming any of the kittens to responsible people who she knows and can check out to let me know, but I doubt she will.
My friend isn't really the one at fault, she has just really annoyed me, firstly by sticking up for this woman and secondly for acting very naively about everything.