Man, you are riding the roller coaster! You need to state something, "I will drop off S3 at 5:30pm", and stick with it, then leave.
Take it from someone who was up/down/up/down/up/down like every other day...
I don't really mind when she can't make up her mind about trivial stuff like this. It's how she's always been. I've learned through years of practice to accept her many foibles. It's when she changes her mind about the relationship or tells me about new guy or is depressed for some reason that I get very anxious. Learning about om was a very low point. I have to get back to higher ground. In other words, detach.
Me-35 Com law-28 S-3 T-6 yrs w/14 mnth bu 1st bu- 2/2012 Rec-4/2013 2nd bu-10/2013 IC-2 yrs(anger issues) MC- 5 mnths-fail OM~1/1/14 OM dumped 6/4/14 New OM ~10/4/14