as you already told her WATER is EXTREMELY important when adding a huge amount of fiber to your diet all at once. some people's body can't handle it. its best to add it slowly.

is she fasting? or eating normally?

could be a food allergy? my sister was chronically constipated and just found out she was allergic to wheat and she poops like crazy now. had a piece of pizza the other day and didnt poop for 3 days.

When I am addressing any health concern, I personally like to use as natural a method as possible, so I always start with diet: foods and liquids. I find them to be much less invasive and taxing as some of the other options available. Diet and cleansing for me is all about communicating with my body, and finding the solution that resonates with me. I haven't found a magical cure all or universal truth that applies to all of us and our myriad of body types and states of health. I am not advising any of these options per se- Just sharing here what works for me based on my personal experience.

- water: it's amazing what some simple hydration can do. What works for me is drinking 1/2 oz per pound of body weight a day, and when cleansing doubling that amount so I drink at least 1 oz of water per pound of body weight. I find quality of water to be important, and use distilled or reverse osmosis water.
- ruffage: raw leafy green vegetables. Eat some everyday and yer bum will thank you. Saturating your salad with heaps of creamy salad dressing is a great way to eliminate all the benefits of eating salad- try substituting your regular dressing with some fresh lemon juice. Some greens, such as collards, can be steamed for 2-3 minutes.
- pear juice: 8- 16 oz in the morning. dilute 50/50 with water if the sugar is too much for you. So gentle, so effective.
- fresh young coconut: drink the juice and also eat the flesh. Delicious and productive.
-exercise! Sedentary lifestyle is an enemy of my colon.
-sugar: also not friends with my colon.

These next three options I have to be alone, in a comfortable environment, and real close to a toilet- not options I choose if I'm headed to work, for example.
- senna tea: Senna is a powerful plant. I drink half a cup of tea when I am on the verge of sleep.
- enemas are a lot less invasive than a colonic (1 quart of fluid vs. gallons) Use an enema bag and make the flush at home- tepid water, and here the quality of water is VERY important. Those prepackaged enemas available at the drug store have a bad rap.
- salt water flushes- 1 quart of tepid water and salt. Unfortunately, requires trial and error to discover the right amount of salt to produce results. Also hard to drink, generally brings a wicked bellyache, makes some people vomit....

Best of luck and happy pooping!