DD1 (21) has an 8 week old baby girl with an ex boyfriend who is not involved. The last 8 weeks have been okay, DD struggled a bit but that's to be expected, being a new single mum. We have had DGD at ours a couple of nights a week and that has helped DD to cope. Yesterday DD dropped DGD off at lunchtime, as she was going to a friends birthday lunch and they were all planning on having a few drinks, nowhere near to the point of getting drunk or anything, but DD thought baby would be better off with me anyway. DH was at work and DD2 (11) was off school due to a twisted ankle she got the day before while walking the dog. It was about an hour after DGD had been dropped off and she was sound asleep in her basket in the living room. I smelt that her nappy needed changing but when I checked her bag that DD had left I realized there were no nappies in there, DD had forgotten. The corner shop is a 2 minute walk away, so I decided to go there to get some. I didn't want to wake DGD up as she looked so peaceful. I figured DD1 would be okay to watch her for 5 minutes while I went to the shop for 5 minutes. DGD was unlikely to wake up, and DD11 is trustworthy enough to stay downstairs and keep an eye on her for such a short amount of time. I gave her a quick rundown, don't disturb baby, but stay in the room until I get back. I told her to phone me straight away if she noticed baby had gone a funny colour/stopped breathing etc just to be on the safe side. Off I went, and I get back to find DD1 had returned early.
DD1 was horrified. She said she got to the bar with her friends and felt like she was just a downer to them as she was so tired and couldn't relate to anything they were talking about so made an excuse to leave. She'd come straight to mine to collect baby only to find me gone and baby alone with DD2. DD2 said she explained I had only nipped to the shop but DD1 was furious. DD1 called me an awful mother and grandmother, claimed I put DGD in a dangerous situation and said "What were you thinking leaving a baby alone with a kid?". I was shocked at this reaction. DD2 is very mature for her age and DD1 has said that to me herself before. But she was so angry at the idea of DD2 being alone with her baby for 5 minutes. If it had been 30 minutes or even 15 it would be a completely different situation but for 5 minutes while the baby is sleeping and DD2 is a metre away from her watching? I feel it is a complete overreaction.
DD1 took baby and left. I haven't heard from her since despite me trying to ring her. DH agrees DD2 has made an issue over nothing and has told me she will come round, saying it's just hormones and lack of sleep. But I'm starting to question if I have messed up. DD2 has been very upset, she feels like her sister doesn't trust her with her niece and DD2 is devastated as she has always been so close with her sister.
WIBU?