Singulair Aggression Problems, Asthma Allergies, Chest Infection, Ontop, Prednisone

My daughter, for the first time tonight, has taken Singulair. After reading all of this I am so scared! She is 5 years old, and has been battling with asthma/allergies for as long as I can remember. This is the 3rd chest infection which has called for steroids since Feb. She is on Prednisone twice a day, and then after about 6 days, going down to Pulmicort inhaler. Ontop of this, she will be taking Singulair every night, along with her claritin. This poor child has been on so much medication, she has become so chubby since the summer. She already has aggression problems (with authority mostly) and is on the line of very hyper. I am so scared! I dont know what to do, and if I should stop this. Her Dr. wants her to continue the Pulmicort for 6-12 months! And ongoing with the Singulair