Asthmatic bronchitis in 4 nd 1/2 yrs old child wth two episodes of pnemonia in 2 months..?

my 4nd1/2 yrs old dgthr hs asthmatic bronchitis since 1 year,she recently had 2 episodes of pnemonia,march nd april 09,after oral antibiotics fr 2 weeks,she rcvrd cmpltly.doc said her immunity level is low so she catches infections easily.we r gving her homeopathic medicines frm a well reputed doctor to build up her immunity and nebulize her whenever any signs of congestion appear to prevent asthmatic attacks,firstly are we doing the right thng by nebulizing her with budesol 0.5 respules whnever reqd,secondly wht else can we do to build her immunity bsidz homeopathic medicines and polybion. syrup.