I have some customers that have done this to me repeatedly (not immediate neighbours though, these are 25 miles away).
Last week two of them (sisters living next door to each other) asked me to do them again. My response was that I am only in this area today and will be finishing at 5:00pm, but will do them if I have the time. If I can't I will be back in a few weeks' time and will do them then if I can fit them in. I cleaned one but ran out of time to do the other. She may not get them done next time either as I have a full day in their village and won't make a special trip for them because they have bumped me before when I did.
In your case, it sounds like it would be a one off clean, so if you were to do them, make sure you make her pay top dollar or remind her of her past attitude towards you (tactfully of course) and walk away.
John