DD1 does this too, she is teething, her 6yo molars of all things so it makes her tired and hungry as eating is painfull. When she gets extra hungry or tired she gets like this, she can't make up her mind she keeps changing it.

I will offer her milk/juice and if she changes her mind it goes on her table for her to have when she is ready. I am 21 weeks pregnant so I know what you mean about getting up and down all the time, I ask DD to bring what she wants help with to me if she can.

While I have been reading and posting this DD started off like your DD, wanted something to eat but when I offered her yoghurt and juice she didn't want it. I ate with her and we cleaned up her toys and found one she really wanted to play with adn she is happily playing again.

I think a lot of it can be wanting attention, DD understands about being pregnant and having a baby so its like she wants all my attention as much as possible. We try and use rewards to encourage her to do the right thing, eg going to see nanna or swimming.