Possible I guess, but again seems very unlikely to me. Maybe she got worried about the consummation with Joffrey and also worried about the Ciersei/Rose Knight wedding and effectively ended both by doing this. It's possible, but she seems far too smart and calculating not to have a better end game than this.
Well we have to wonder who has anything to gain from Joffrey's wedding Lady Oleana does no longer have worry about the Monster possibly beating Margery as he beat Sansa, but who else might be involved as another poster noted.
On the other hand, I don't think Sansa could have pulled it off, and if she did, certainly it wasn't alone.
Perhaps a poisoning of a king would require the resources more than one party that has an interest in such things?
Minor book spoiler about events prior to the series so I don't think spoiler tags are really necessary.
A previous king in the past prior to events on the show was witnessed by the Kings Guard raping his wife due to the nature of the oath of the King's Guard a senior member prevented the younger king's guardsman from stopping that rape.
How would Loras Tyrell react to that? Lady Oleana probably worried about that possibility as well. Loras Tyrell in addition to being a renowned pillow biter also happens to be a very good fighter which also by events in the second season informs us of Lady Brienne's capability as a fighter.
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