I would ask your client if she recalls a particularly stressful event prior to the onset of acid reflux. Thinking about the meridian clock, the meridian most involved in the stress response is Triple Warmer, active 9-11 PM. It sits in polarity to Spleen, active 9-11 AM. Stomach is the yang partner to spleen, and it's adjacent time is 7-9 AM. When there is a stress related imbalance the first to be impacted are spleen/pancreas and stomach.
In some clients there is more imbalance that shows up in the yin, or Spleen meridian. In others, it shows up more readily in the Stomach meridian. I would wonder if she has a yin or a yang pattern in terms of the meridians that are first to show an imbalance.
In any case, there are many Eden Energy Medicine exercises that help bring more balance to TW/Spleen, and thus to the body overall. A simple one is the Spleen hug. Bring the right hand around to hold the left corner of the waist over the spleen and its meridian. Bring the left hand to hold the right elbow on the pathway of the Triple Warmer meridian. Take deep breaths, drop the shoulders, and let the body release some stress.
It's also good to "flush" triple warmer. That is, trace it backwards from the temple through the shoulder, elbow, wrist, and off the ring finger. Then do the same on the other side. There are several variations of this simple destressing activity. But these two exercises are a good beginning.
It's important to remind clients that stress is involved in 99 44/100ths % of all discomfort, pain, and disease. Further, thoughts generate a good deal of this stress. Triple Warmer's question is "Am I Safe?" Any fearful thoughts - whether about personal symptoms, finances, or what the leader of North Korea threatens - will all notify Triple Warmer that it needs to work hard just to keep you alive. Increasing consciousness of thinking patterns is an important step in healing whatever the diagnosis.