moulting? & worming?

hi!
i am 3 days into worming my 4 banties.  After remarking how neat & perfect Tracey was, she nows looks like she has been through a hedge backwards! feathers are coming out & i assume that she is moulting.  But i am worried that this has been brought about by being wormed? she was broody a little while back but came out of that within a week and seemed to be looking in good shape.  Should i be worried? also worming using the flubenvet is such a pallava when ive only got 4 banties to do, does anyone know hoew to give an indiviudual dose to each hen on a daily basis rather than mixing it up with their feed and not allowing them any other food? i look forward to hearing from you!
many thanks,lucylou

we used flubenvet and had read about the grapes.. but the first time we did it Snowflake dashed in and stole Wendy's as she is suspicious and inspects everything we offer her and has to break everything up before eating....Snowflake swallows grapes whole so got a double dose

 the next day we used baked beans, dipping 6 in the powder and then hubby lifted one at a time out of the run while I was in charge of holding the beans .... it worked with tinned corn too and was less messy than the beans