I am looking for any information anyone has about the possibility...

I am looking for any information anyone has about the possibility that Singulair causes colitis or that it can lead to inflamed colon and bleeding colon. My daughter is 4 years old and has never been a sick child. In September, she started bleeding from her colon, and a month later, she was finally diagnosed with colitis after having a colonoscopy. The doctor prescribed Prednisone (steriod) and Phlagyll (antibiotic) (spelling?). I decided to stop giving her the Singulair that she had previously been taking because I didn;t want her to have so many drugs in her system as one time. After a few days of the steriods and antibiotics, she was well, with no signs of problems. Everything was going great for a few weeks, but last week I started giving her the Singulair again, and her colits symptoms have come back. Has anyone else experienced this in relation to Singulair?