The only thing I still see as an issue is that you (like all of us) are reading too much into what she is doing.
I think it's been said before, but you said it right off the top. "She thought the the mail was important", seems reasonable and unless she wants to be really vindictive I cannot imagine she would want you to be late on bill payments.
I think the way you handled the situation was fantastic, but I think there should be less analyzing of motives.
I wonder when she will contact you next and for what?
BITS SIC
Me - 34 W - 33 M - 8 years T - 15 years D7, D5, D2 Bomb Nov 10/2010 "I'm not happy and INILWY" W Staying for the kids Mar 13/2011