Seems to be the meltdowns are at transition times so I think the "we are doing ____ in xxx minutes" will maybe help the best. She is still young but it's never to early to start this habit IMO. I do this all the time actually even though none of my kids have meltdowns when it's time to do these things. I just think it's nice for them to know whats coming. I know I like to know whats going on haha. I even tell my other half "I'm going to be ready to leave the house in 10 mins...be ready!" LOL

Time outs could help as well but seeing as these tantrums are happening during transition times, I know that timeouts won't always be convenient. If you go this route, be consistent even if it means that all the kids now have to wait to go in, go out, eat, etc.

Some kids are just not the greatest at transitioning(typica lly kids who don't like change) so I hope you find something that works and that is won't be an ongoing issue as I know how exhausting that gets!!