1. My guess why CA didn't respond ASAP to these thefts:
She had to know about the check thefts. How could she not, what with the amounts, and the zero-ing of bank balances which caused more bounced checks, etc. Going through the recent-enough GA theft ordeal. Trying to catch up financially. She knew. She'd have to be comatose not to.
2. CA's default mode seems to be denial, and i think that's the deep rabbit hole she went down after the major check thefts began in December 2007.
I think her fear about OCA's increasingly erratic and angry behavior-- including but not restricted to the thefts-- was too great for her to face, all the more so because it caused her own increasing rage that she would not allow herself to confront or deal with either. Deny, deny, deny.
2. One of my guesses about OCA's check theft behavior:
I think OCA starting the major check thefts for the simple reason that she wanted stuff, she didn't have money of her own, and it didn't bother her one wit to steal.
After the first round of thefts, I think a different dynamic began. OCA saw that CA was staying silent on the matter, so she upped the ante, both because she knew she could, and because she was curious how far she could go before CA cracked. She likely relished this means of tormenting and controlling her mother.
OCA must have been especially gratified about this particular torment because it was a perfect and on-point revenge for CA ignoring OCA's objections and allowing thieving GA back into the household. (That insult still very much on OCA's mind through June 2008).
More thefts, daily thefts, and still no response from CA. OCA must have despised and felt more contemptuous of CA by the day.
At some point I think the lack of a response from CA might have caused OCA a different flavor of rage. Here she was, as in CA's face as she could possibly get, and her mother STILL wouldn't acknowledge her.
More thefts by OCA, more silence from CA, increasing rage felt by both, a battle of wills.
Finally, in silence, without giving OCA the satisfaction of a confrontation, CA won the battle by closing her account. Take THAT, daughter.
I think it's possible that the rage OCA felt after CA closed the account (neck breaking Googles, etc) wasn't so much because she had her spending avenue cut off, but because her mother had once again, from OCA's perspective, taken back absolute control of OCA. And THAT loss of control, OCA's bottom line, she was absolutely NOT going to tolerate.
Just a theory.