Hello Cheny24,
This does sound like
constipation; however, the question then becomes what is the cause of her
constipation. If she has not been evaluated for this I would recommend you discuss with her doctor about being tested for
hypothyroidism, celiac disease and possibly hirschsprung's disease. All these conditions (which are not particularly uncommon, with celiac disease reaching an estimate of 1 in every 100 people) can cause
constipation.
Functional
constipation (
constipation where there isn't a problem such as those above) is also quite common. It is often treated with osmotic medications such as polyethylene glycol (miralax or glycolax are common names of this). I suspect this is the medicine that your daughter had previously used.
You may want to consider having your daughter evaluated by a GI specialists. At this point, her
constipation may be so significant that she may need more aggressive medications to help clean out her colon (such as enemas or a medicine called golytely).
It can take some effort but this issue can usually be overcome. The point that failure often occurs is after the colon is cleaned out. The problem with
constipation is that the intestines are stretched and loose their ability to sense that they are full. After the colon is cleaned out, the colon needs to be kept at a normal diameter for 6-12 months allowing the intestines to regain their sensations. To do this, a stool softener and good bowel habits are needed to keep the stool very soft and the intestines essentially empty during this time. It's a long process but this generally will resolve the issue (assuming one of the above or another illness isn't going on that needs to be corrected).
Best wishes.
Advice and opinions given are based on the information provided and must not be used as an official medical recommendation. The limitations of the internet prevent an appropriate evaluation. Always consult your doctor if there is concern.