If your mother is not drinking much, then this is definitely one reason why her acidity and her test readings have increased. You do not say if she cannot drink, or if she prefers not to drink much.
Either way, using Miracle-Mineral-Supplement and NOT drinking much will absolutely result in a deeper toxicity in the body. Miracle-Mineral-Supplement produces a ton of toxic by products from the pathogens it destroys ... the way to clear these is to drink. In order for your mother to detox her body, she is going to have to drink a lot more.
As far as the "green" food part of it, this is crucial to getting better on MMS. The fact that her body does not like green veggies is a possible indication of its acidity.
This is one reason why blended veggie smoothies can work well.