keeping you in my thoughts....I know 5 was our "magic" hour....I was distracted trying to get dinner on the table, the kids were getting hungry, the kids were getting irritated with each other, and I was running low on patience....

Is there anything that consistently happens around this time that you can think of?

Like healing said - I think hunger and fatigue are biggies..also would like to add boredom or possibly over-stimulation, and for her in particular - it could be that memories/reality are catching up with her. Maybe she is thinking about her mom or something like that...

It's great that you have identified a time - now maybe try to see what is going on in her environment that could be triggering her.....