Slow down. This is just her initial response. Give her a couple of days to think about it...her position isn't going to harden any, and it might soften if she's left to her own devices. Right now you've pushed and she's pushed back, claiming her space. Given the opportunity to give up some of her space, rather than (as she perceives it) having her space taken from her, she may be more flexible than she appears right now.
What she said reflects her state of mind at the current moment and that's all. Give her a chance, in a couple of days, to say something like, "You know, I'd *like* to ML once a week, I'm just too tired and hassled to want to." That would be progress. Maybe there's no chance it will happen, but I'd vote for just standing still for a bit and seeing if she's capable of moving off center on her own a little.
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