In the high chair today was 100% an 'I'm done with this' purposeful scream-no tears. I apologised to the others, and let them leave as they finished (normally everyone stays til the end). I sat in front of her just looking at her until she stopped, then took her to get changed, she started again, and continued until I popped her in the play pen. At least she has 2 decent naps-gives my ears a chance to stop ringing!!
I'll try your advice Lee-Bee, on Monday I'll change her before her usual scream times, so it can be an instant scream=bed! She does cry when overtired, but a sobbing snotty-teary-face pressed up against the glass door while I warm her milk kind of deal. That doesn't bother me, because I feel like she can't control that yet.