I would only be hazzarding a guess based on the pictures but it seems to me that your PH has dropped quite low and nitrogen (along with other nutrients) are now locked out, but unless your able to get your hands on a ph meter to check her runoff water its just a thought. The drop kits are not always very accurate in measuring runoff water as it tends to already be coloured when it runs out of the pot.

Also have you considered your watering? Is it possible she's got a bit water logged, can water run easily out the bottom of her pot?
Fixes for plants in soil do take a long time, they take a while to respond. If your able to get her a bigger pot and some good soil next week then probably a couple of waters with your tap water wouldn't hurt I don't think. Do you think that perhaps you've adjusted the water too low previously using the drop test kit? They can be tricky critters.