Well done for texting her OP 
We had a similar situation but ours went on for 2 years solid.We are friends with the couple and both of they're DC but the parents just got into the habit of expecting it.Each day was maybe another 10 minutes worth of petrol,picking them up from where they live and dropping them home again.
It might not sound alot but it already costs us about £200 a month in fuel for the car and that's without bad traffic,if the traffics really bad(which it has been alot)it can go upto £300 a month and that just to do the school runs.
There'd be times that we had to leave earlier because our DC had something on at school before normal school hours,other time's our DC or one of they're DC would have something on after school.One time my DH picked up our 4DC and went to pick up they're 2DC and they're oldest had wondered off,my poor DH and the the rest of the children drove around for nearly an hour searching for him when his Mum rung up and said he'd walked home.
His Mum and Dad did go mad at him but it just got to much,so he told them he was really sorry he wouldn't be able to do it anymore because our DC had lots of different things before school and after school,it was true they did and all was fine for a few days.
But they'd still ring my DH at the last minute at least 3 times a week,so he started ignoring the calls so then they'd pop round or send one of they're DC round to ask for a lift.
They had done us favours in the past and picked our DC up from school about 8 times over those 2 years and they did lend us a spare car once when our old car broke down for about a week,my DH gave it back with a full tank of fuel and we sent round some chocs and flowers as an extra thankyou.But we never got as much as 50p towards the fuel we'd spent.I think some people just don't get it,our friends are some of those people!They're lovely but pretty clueless when it comes to things like this.Though they're great at Birthdays and Christmas it's the every day stuff like the lifts they don't seem to get.
But for you it sounded even worse,not thanking you and neither of you really being friends with either of them and not picking your DD and leaving her for an hour is unforgivable!