It sounds very much like your GD is unsettled by the changes around her.
It might be an idea for your DD to set a routine that she can hold to, breakfast, teeth, dress, read a book/quiet play, a trip out after plenty of warning, lunch, etc then a gentle wind down toward bedtime.
I'd suggest, where possible, to ignore the tantrums, and act as though they never happened, unless of course she is at risk.
My then 4yr old GD, (now 10), decided she didn't want to walk through a shopping centre and sat down, refusing all attempts to get her to move. I walked to the side, watching her all the time while she kicked and screamed at me. I continted to ignore her and after 10, (long), minutes she got up, came over to me and hugged me. That was when I realised that we were being watched by a security guard, 2 police officers and my daughter!
My GD never pulled that tantrum again.