Brief Answer:
Need proper investigations and treatment.

Detailed Answer:
Hi.
Thank for your query, albeit short and specific.
To recapitulate: Female/6 - wants to know where the bowel is located - impacted for a few weeks - tried Cascara Sagrada, one fleet enema,bicarbonate drink - wants to know what can be done to help oneself...

I would advise you the following:
Since you are 6 years old, and the bowel is impacted for a few weeks, there is a strong possibility of a mechanical obstruction which needs to be investigated and treated properly. You have already tried everything possible as you have mentioned above.
The bowel is located all over the abdomen.
Hence you should consult a Doctor for
Clinical evaluation and examination.
X-ray of the abdomen to see the shadow of the fecoliths, gas, possible dilatation of intestines suggestive of the obstruction.
CT scan of the abdomen when required.
Saline-soap enema may be needed or other ways to cleans the bowel depending upon the situation, the cause and so on.
After preparation colonoscopy may be required.

Please go for these solutions and proper investigations to confirm or rule out the possibilities so that a proper diagnosis and proper plan of actions can be taken.

I hope this answer helps you, please feel free to ask for further relevant queries if you feel that there is a gap of communication.

---