DD (almost 15) has been working all hours under the sun during the summer to save up for a trip she wants to go to (and has made me very proud [boasting emoticon])
A neighbour asked her if she'd babysit for them this week, as their childminder had had an accident and was in hospital (she's gonna be ok). 9 hours a day, 7am to 4pm, takes 3yo to nursery at 7.30, looks after 18month old, picks up 3yo at 3pm, pretty straighforward stuff. The family has been living next door for 6 years, we know them quite a bit, have BBQs together etc.
DD went for her first day today and has just called me very upset and doesn't know what to do. Apparently when she arrived 3yo was all dressed so she started dressing 18mo for the school run, mum was still there and said "oh, don't bother with him". DD assumed mum was gonna be there until she went back, but she got back to find the baby all alone cryin hysterically to the point of throwing up. She called the mum and the mum said "don't worry, it's what we noramlly do, it's only 15 minutes and he's used to it. A bit of cryin never hurt anybody".
Now I don't know what to do. First of all, apart from cruel I think it's also dangerous to leave such a young child alone in the house, 15 or 20 minutes is a very long time. Secondly, I don't want DD involved if something were to happen.
AIBU and where do I go from here?