This is probably going to be rather lengthy.
i am a childminder and for the last year have been looking after one mindee for very long hours each week. The last 6 months have been awful and i have really been there for the mother when she has needed help, for example taking her to work when her partner refused to. the child has become more and more challenging over the last few months, i have successfully weaned him off of baby jars, however his behaviour has got really bad and it got to the stage i can no longer tar him to any groups or activity as he screamed the whole time and picked on other children.
we moved to a different area recently and i agreed that i would meet her in the mornings at her work to pick him up, this was up until i go on maternity leave am 23 weeks now. this turned in to her demanding i drop him in evenings also, i did it as losing her money was not an option we could do. she has subsequently taken the piss more and more examples...
- she constantly gives him to me when he is ill. he had the start of chicken pox virus gave it to me and i got shingles (11 weeks pregnant) the week before last he arrived obviously full of cold and very unhappy i ended up with the cold and have spent the last week in bed feeling totally awful. when asked to pick him up she would arrive 3 hours later. i have taken him to the Dr on many occasion.
-she never pays me on time. pay day is Friday it usually arrives Sunday.
- i was running a couple minutes behind schedule and she was waiting for me for 3 minutes maximum she stood and shouted at me. had rang me several times.
I am getting to the point now 
the parent is always talking about twitter, saying how fun it is to stalk celebs etc, from what she said her life is played out on it.
A couple of weekends back i was waiting on her paying me. I had said on the Friday i really needed it on time as we were going out for the day she said to text her in the morning and she would pay straight away, i did this and got no response and no money. in the end we couldn't go out for the day this started the total breakdown of me wanting to deal with her anymore. Eventually she messaged me on the Sunday evening to say she had been ill and not had her phone with her, dh didn't believe her and decided to look her up on twitter...
I discovered she had not been ill in bed.. she had been out for the day there were photos and 'tweets' from the whole day... 
I have been having a awful pregnancy, was going to go on mat leave at 26 weeks, however have another water infections, a cold still and feel pretty awful and tearfull at the thought of a tantruming child 10 hours per day for the next 3 weeks, the driving twice a day 7.30am i have to hurl dd in the car. also the fact i work 2 days free a week for her with all the expense she doesn't cover
so i called her last night, explained that i don't feel i can be her child minder any more due to my health and that i would not be returning to working. I've not left her in any predicament as her mum is here helping her the last week I've been off. she was very nice about it and i said i would refund what i owe her if she sent bank details to me, excellent i thought. until dh said that he finds it odd that she was so nice when she was always having digs at me so we had a little sneak on twitter....
There are really awful things that she is saying about me, one says "childminder can't be arsed anymore so it going to be a jobless bum, may as well pay her wages through taxes now!!"
after looking through a bit further there are regular tweets about me rather nasty.
My aibu is...would ibu if i either...
A) delayed her money like she has done to me several times.
B) make my own twittter and follow her and hope it makes her feel a little bit ashamed for what she has said.
C) when sending her an email with how much i owe her add in there a line like "can't wait for my maternity pay to start in a few weeks guess i will just be a jobless bum till then LOL."