After the marriage at sea...no matter how valid or not valid it may be, Anna couldn't run to Larry. She had trapped herself (after KE "talked her into marrying Howard"...and I believe Anna originally thought the marriage would totally hold up or cause a monstrous law case.
I thought that Howard said on the stand that the marriage was bad advice and that "it was being litigated".
“””Anna might have been considering marrying Larry at some point and KE passed it on to Howard....””””
That’s where I was heading...Anna was the only party eager to marry Larry. All the others were opposed; HK$, Larry and Dr.E.
It’s pretty clear she had to be drugged into *committing* to HK$ and only after tons of KE’s persuasive medication.