Me too, I rang my mum when dp was on the floor (and could not physically get up!) with an injured back and the gp had prescribed some diazepam over the phone, I really needed her to either pick up the prescription (in her car, which I don't have) or come and watch 2 year old ds for and hour while I went.
I had had D&V for 3 days, was 5 months pregnant, and it was 45 minutes befor the surgery closed.
She said she had gasmen coming to give a quote, and my brother (20 yo fgs!) couldn't be trusted to let them in.
So I had to load toddler into pushchair, leave dp on the floor with the phone, and stagger the 1/2 hour walk to the surgery, then 1/2 hour back, having not eaten for 3 days.
I usually get on well with her, but she makes me very resentful that now she has enough money and doesn't need to borrow, she never ever visits. She lives a 20 minute walk away.
And at the moment she told me that she wouldn't help me, although in that situation I would have helped a neighbour I wasn't fond of, never mind my daughter, I am sad to say I hated her a little just then.
Ooooops! this wasn't meant to turn into a self pitying rant, but it's safe to say that if they won't help you when you need it, they will never help you. It is blindingly obvious to any woman who has ever raised children that you need a break, yet she hasn't offered? Then she isn't going to.