This is just not true. Deadline reported that Anna Faris informed production of her departure early in the hiatus. They had plenty of notice about it. Yes, it was a blow and maybe they weren't happy, but I suspect that since there was no push back on the actress from anyone including Chuck Lorre, who has no problem showing his displeasure with actors who leave his show, that she had a good, but personal and private reason for it. They didn't officially announce it until September, but she didn't just decide not to come back the week before.